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Single UNIX Specification
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<h2 id="history">History</h2> <h3>1980s: Motivation</h3> <p>The SUS emerged from multiple 1980s efforts to standardize <a href="/facts/Operating_system/8XTuvMh2">operating system</a> <a href="/facts/Interface_(computer_science)/zdfp8unT">interfaces</a> for software designed for variants of the Unix operating system. The need for standardization arose because enterprises using computers wanted to be able to develop programs that could be used on the computer systems of different manufacturers without reimplementing the programs. Unix was selected as the basis for a standard system interface partly because it was manufacturer-neutral. </p><p>In 1984, the UNIX user group called /usr/group published the results of their standardization effort for programming interfaces in their 1984 /usr/group standard, which became basis for what would become the POSIX.1-1988 standard.<a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a><a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a> </p><p>In 1985, AT&T published <a href="/facts/System_V_Interface_Definition/kwaLtGq8">System V Interface Definition</a> (SVID), a specification of UNIX System V programming interfaces.<a class="footnote-ref" id="fnref:6" href="#fn:6"><sup>6</sup></a> </p> <h3>1988: POSIX</h3> <p>In 1988, standardization efforts resulted in IEEE 1003 (also registered as <a href="/facts/International_Organization_for_Standardization/IacYR7Yg">ISO</a>/<a href="/facts/International_Electrotechnical_Commission/hSK0kjwI">IEC</a> 9945), or <a href="/facts/POSIX/mQkSt234">POSIX</a>.1-1988, which loosely stands for Portable Operating System Interface. </p> <h3>1980s and 1990s: X/Open Portability Guide</h3> <p>The <a href="/facts/X/Open_Portability_Guide/btwVKbX2">X/Open Portability Guide</a> (XPG) was a precursor to the SUS, published by the <a href="/facts/X/Open_Company/btwVKbX2">X/Open Company</a>, a consortium of companies established in 1984. The guides were published in the following years. </p> <ul><li>XPG1: X/Open Portability Guide Issue 1: 1985<a class="footnote-ref" id="fnref:7" href="#fn:7"><sup>7</sup></a></li> <li>XPG2: X/Open Portability Guide Issue 2: 1987<a class="footnote-ref" id="fnref:8" href="#fn:8"><sup>8</sup></a></li> <li>XPG3: X/Open Portability Guide Issue 3: 1989<a class="footnote-ref" id="fnref:9" href="#fn:9"><sup>9</sup></a></li> <li>XPG4: X/Open Portability Guide Issue 4: 1992<a class="footnote-ref" id="fnref:10" href="#fn:10"><sup>10</sup></a></li></ul> <p>XPG4 Base included the following documents: </p> <ul><li>System Interface Definitions, Issue 4, <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 1-872630-46-4</li> <li>System Interfaces and Headers, Issue 4, <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 1-872630-47-2</li> <li>Commands and Utilities, Issue 4, <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 1-872630-48-0</li></ul> <h3>1990s: Spec 1170</h3> <p>In the early 1990s, a separate effort known as the Common API Specification or Spec 1170 was initiated by several major vendors,<a class="footnote-ref" id="fnref:11" href="#fn:11"><sup>11</sup></a> who formed the <a href="/facts/Common_Open_Software_Environment/hybc7DNk">COSE</a> alliance in the wake of the <a href="/facts/Unix_wars/qn70n7IA">Unix wars</a>. In 1993, Spec 1170 was assigned by COSE to <a href="/facts/X/Open/btwVKbX2">X/Open</a> for fasttrack.<a class="footnote-ref" id="fnref:12" href="#fn:12"><sup>12</sup></a> In October 1993, a planned transfer of UNIX trademark from Novell to X/Open was announced;<a class="footnote-ref" id="fnref:13" href="#fn:13"><sup>13</sup></a> it was finalized in 2nd quarter of 1994.<a class="footnote-ref" id="fnref:14" href="#fn:14"><sup>14</sup></a> Spec 1170 would eventually become the Single Unix Specification.<a class="footnote-ref" id="fnref:15" href="#fn:15"><sup>15</sup></a> </p> <h3>1994: Single UNIX Specification</h3> <p>In 1994, the X/Open Company released the Single UNIX Specification.<a class="footnote-ref" id="fnref:16" href="#fn:16"><sup>16</sup></a> The SUS was made up of documents that were part of the X/Open Common Applications Environment (CAE):<a class="footnote-ref" id="fnref:17" href="#fn:17"><sup>17</sup></a> </p> <ul><li>System Interface Definitions, Issue 4, Version 2<a class="footnote-ref" id="fnref:18" href="#fn:18"><sup>18</sup></a></li> <li>System Interfaces and Headers, Issue 4, Version 2<a class="footnote-ref" id="fnref:19" href="#fn:19"><sup>19</sup></a></li> <li>Commands and Utilities, Issue 4, Version 2<a class="footnote-ref" id="fnref:20" href="#fn:20"><sup>20</sup></a></li> <li>Networking Services, Issue 4<a class="footnote-ref" id="fnref:21" href="#fn:21"><sup>21</sup></a></li></ul> <p>This was a repackaging of the <a href="/facts/X/Open_Portability_Guide/btwVKbX2">X/Open Portability Guide</a> (XPG), Issue 4, Version 2. </p><p>Sources differ on whether X/Open Curses, Issue 4, Version 2 was part of this SUS;<a class="footnote-ref" id="fnref:22" href="#fn:22"><sup>22</sup></a><a class="footnote-ref" id="fnref:23" href="#fn:23"><sup>23</sup></a> its copyright date is given as 1996.<a class="footnote-ref" id="fnref:24" href="#fn:24"><sup>24</sup></a> X/Open Curses, Issue 4 was published in 1995.<a class="footnote-ref" id="fnref:25" href="#fn:25"><sup>25</sup></a> </p><p>In October 1994, X/Open indicated they were going to refer to Spec 1170 as '"Single-Unix" specification'.<a class="footnote-ref" id="fnref:26" href="#fn:26"><sup>26</sup></a> </p><p>The SUS was at the core of the UNIX 95 brand.<a class="footnote-ref" id="fnref:27" href="#fn:27"><sup>27</sup></a> </p><p>This version had 1168 programming interfaces.<a class="footnote-ref" id="fnref:28" href="#fn:28"><sup>28</sup></a> </p><p>This version of SUS was drawn from the following sources:<a class="footnote-ref" id="fnref:29" href="#fn:29"><sup>29</sup></a> </p> <ul><li>XPG4 Base by X/Open</li> <li><a href="/facts/System_V_Interface_Definition/kwaLtGq8">System V Interface Definition</a>, (SVID) Edition 3, Level 1 calls by AT&T</li> <li>Application Environment Specification (AES) by the <a href="/facts/Open_Software_Foundation/sBn7Q7gt">Open Software Foundation</a> (OSF)</li> <li>Interfaces found in common use and not yet covered by a formal specification, drawn from a survey of major applications.</li></ul> <h3>1997: Single UNIX Specification, version 2</h3> <p>In 1996, X/Open merged with <a href="/facts/Open_Software_Foundation/sBn7Q7gt">Open Software Foundation</a> (OSF) to form <a href="/facts/The_Open_Group/uRoDdEae">The Open Group</a>.<a class="footnote-ref" id="fnref:30" href="#fn:30"><sup>30</sup></a><a class="footnote-ref" id="fnref:31" href="#fn:31"><sup>31</sup></a> </p><p>In 1997, the Open Group released the Single UNIX Specification, Version 2.<a class="footnote-ref" id="fnref:32" href="#fn:32"><sup>32</sup></a><a class="footnote-ref" id="fnref:33" href="#fn:33"><sup>33</sup></a> </p><p>This specification consisted of:<a class="footnote-ref" id="fnref:34" href="#fn:34"><sup>34</sup></a> </p> <ul><li>System Interface Definitions, Issue 5,<a class="footnote-ref" id="fnref:35" href="#fn:35"><sup>35</sup></a></li> <li>System Interfaces and Headers, Issue 5,<a class="footnote-ref" id="fnref:36" href="#fn:36"><sup>36</sup></a></li> <li>Commands and Utilities, Issue 5,<a class="footnote-ref" id="fnref:37" href="#fn:37"><sup>37</sup></a></li> <li>Networking Services, Issue 5,<a class="footnote-ref" id="fnref:38" href="#fn:38"><sup>38</sup></a></li> <li>X/Open Curses, Issue 4, Version 2,<a class="footnote-ref" id="fnref:39" href="#fn:39"><sup>39</sup></a></li></ul> <p>and was at the core of the UNIX 98 brand.<a class="footnote-ref" id="fnref:40" href="#fn:40"><sup>40</sup></a> </p><p>This version had 1434 programming interfaces.<a class="footnote-ref" id="fnref:41" href="#fn:41"><sup>41</sup></a> </p> <h3>2001: Single UNIX Specification, version 3, POSIX.1-2001</h3> <p>Beginning in 1998, a joint <a href="/facts/Working_group/dFlAPASD">working group</a> of IEEE, ISO JTC 1 SC22 and The Open Group known as the <a href="/facts/Austin_Group/jp42JtPP">Austin Group</a> began to develop the combined standard that would be known as the core of Single UNIX Specification, Version 3 and as POSIX.1-2001. It was released on January 30, 2002.<a class="footnote-ref" id="fnref:42" href="#fn:42"><sup>42</sup></a> </p><p>This SUS consisted of:<a class="footnote-ref" id="fnref:43" href="#fn:43"><sup>43</sup></a> </p> <ul><li>Base Specifications, Issue 6 <ul><li>Base Definitions, Issue 6</li> <li>System Interfaces, Issue 6</li> <li>Shell and Utilities, Issue 6</li> <li>Rationale (Informative)</li></ul></li> <li>X/Open Curses, Issue 4, Version 2</li></ul> <p>and is at the core of the UNIX 03 brand.<a class="footnote-ref" id="fnref:44" href="#fn:44"><sup>44</sup></a> </p><p>The Base Specifications are technically identical to POSIX.1-2001, which is IEEE Std 1003.1-2001.<a class="footnote-ref" id="fnref:45" href="#fn:45"><sup>45</sup></a> </p><p>This version had 1742 programming interfaces.<a class="footnote-ref" id="fnref:46" href="#fn:46"><sup>46</sup></a> </p><p>An authorized guide is available for the version.<a class="footnote-ref" id="fnref:47" href="#fn:47"><sup>47</sup></a> </p> <h4>2004 Edition</h4> <p>In 2004, a new edition of the POSIX.1-2001 standard was released, incorporating two technical corrigenda.<a class="footnote-ref" id="fnref:48" href="#fn:48"><sup>48</sup></a><a class="footnote-ref" id="fnref:49" href="#fn:49"><sup>49</sup></a> It is called IEEE Std 1003.1, 2004 Edition.<a class="footnote-ref" id="fnref:50" href="#fn:50"><sup>50</sup></a> Some informally call it POSIX.1-2004,<a class="footnote-ref" id="fnref:51" href="#fn:51"><sup>51</sup></a><a class="footnote-ref" id="fnref:52" href="#fn:52"><sup>52</sup></a><a class="footnote-ref" id="fnref:53" href="#fn:53"><sup>53</sup></a> but this is not an official identification. </p> <h3>2008: Single UNIX Specification, version 4, POSIX.1-2008</h3> <p>In December 2008, the <a href="/facts/Austin_Group/jp42JtPP">Austin Group</a> published a new major revision of SUS and POSIX.<a class="footnote-ref" id="fnref:54" href="#fn:54"><sup>54</sup></a><a class="footnote-ref" id="fnref:55" href="#fn:55"><sup>55</sup></a><a class="footnote-ref" id="fnref:56" href="#fn:56"><sup>56</sup></a> This is the Single UNIX Specification, Version 4 (SUSv4).<a class="footnote-ref" id="fnref:57" href="#fn:57"><sup>57</sup></a> </p><p>This SUS consists of:<a class="footnote-ref" id="fnref:58" href="#fn:58"><sup>58</sup></a> </p> <ul><li>Base Specifications, Issue 7 <ul><li>Base Definitions, Issue 7</li> <li>System Interfaces, Issue 7</li> <li>Shell and Utilities, Issue 7</li> <li>Rationale, Issue 7, (Informative)</li></ul></li> <li>X/Open Curses, Issue 7</li></ul> <p>The Base Specifications are technically identical to POSIX.1-2008, which is IEEE Std 1003.1-2008.<a class="footnote-ref" id="fnref:59" href="#fn:59"><sup>59</sup></a> </p><p>This version had 1833 interfaces, of which 1191 were in the System Interfaces section.<a class="footnote-ref" id="fnref:60" href="#fn:60"><sup>60</sup></a> </p> <h4>2013 Edition</h4> <p>Technical Corrigendum 1 mostly targeted internationalization, and also introduced a role-based access model. A trademark <i>UNIX V7</i> (not to be confused with <a href="/facts/Version_7_Unix/ju5nRs7k">V7 UNIX</a>, the version of <a href="/facts/Research_Unix/5oWmUdwo">Research Unix</a> from 1979) was created to mark compliance with SUS Version 4.<a class="footnote-ref" id="fnref:61" href="#fn:61"><sup>61</sup></a> </p> <h4>2016 Edition</h4> <p>Technical Corrigendum 2 was published in September 2016, leading into <i>IEEE Std 1003.1-2008, 2016 Edition</i> and <i>Single UNIX Specification, Version 4, 2016 Edition</i>. </p> <h4>2018 Edition, POSIX.1-2017</h4> <p>In January 2018, an "administrative rollup" edition was released. It incorporates Single UNIX Specification version 4 TC1 and TC2, and is technically identical to the 2016 edition.<a class="footnote-ref" id="fnref:62" href="#fn:62"><sup>62</sup></a> </p><p>The Base Specifications are technically identical to POSIX.1-2017, which is IEEE Std 1003.1-2017.<a class="footnote-ref" id="fnref:63" href="#fn:63"><sup>63</sup></a> </p> <h2 id="specification">Specification</h2> <p>SUSv3 totals some 3700 pages, which are divided into four main parts: </p> <ul><li>Base Definitions (XBD) - a list of definitions and conventions used in the specifications and a list of <a href="/facts/C_header_file/fg3KEG4V">C header files</a> which must be provided by compliant systems. 84 header files in total are provided.</li> <li>Shell and Utilities (XCU) - a list of utilities and a description of the shell, <a href="/facts/Bourne_shell/wUCh3Qkl">sh</a>. 160 utilities in total are specified.</li> <li>System Interfaces (XSH) - contains the specification of various functions which are implemented as <a href="/facts/System_call/NW44AFJr">system calls</a> or <a href="/facts/Library_(computing)/xRzL3P7q">library</a> functions. 1123 system interfaces in total are specified.</li> <li>Rationale (XRAT) - the explanation behind the standard.</li></ul> <p>The standard user command line and scripting interface is the <a href="/facts/POSIX/mQkSt234">POSIX</a> shell, an extension of the <a href="/facts/Bourne_Shell/wUCh3Qkl">Bourne Shell</a> based on an early version of the <a href="/facts/Korn_Shell/MMp8fQ4A">Korn Shell</a>. Other user-level programs, services and utilities include <a href="/facts/AWK/lAQ0leyj">awk</a>, <a href="/facts/Echo_(command)/ue5jH01X">echo</a>, <a href="/facts/Ed_(text_editor)/a3lSk6Ry">ed</a>, <a href="/facts/Vi_(text_editor)/d8G1PkDh">vi</a>, and hundreds of others. Required program-level services include basic <a href="/facts/Input/output/WQTE8Jas">I/O</a> (<a href="/facts/Computer_file/FjFH3Ufm">file</a>, <a href="/facts/Computer_terminal/fSlx05qV">terminal</a>, and <a href="/facts/Computer_network/3w5RM99p">network</a>) services. A test suite accompanies the standard. It is called PCTS or the POSIX Certification Test Suite. </p><p>Additionally, SUS includes <a href="/facts/Curses_(programming_library)/IdMt3bH8">CURSES</a> (XCURSES) specification, which specifies 372 functions and 3 header files. All in all, SUSv3 specifies 1742 interfaces. </p><p>Note that a system need not include <a href="/facts/Source_code/o9J6Jv23">source code</a> derived in any way from AT&T Unix to meet the specification. For instance, <a href="/facts/IBM/QszA7nwd">IBM</a> <a href="/facts/OS/390/9buuv7H9">OS/390</a>, now <a href="/facts/Z/OS/amLCAlgV">z/OS</a>, qualifies as UNIX despite having no code in common.<a class="footnote-ref" id="fnref:64" href="#fn:64"><sup>64</sup></a> </p> <h2 id="marks-for-compliant-systems">Marks for compliant systems</h2> <p>There are five official marks for conforming systems:<a class="footnote-ref" id="fnref:65" href="#fn:65"><sup>65</sup></a><a class="footnote-ref" id="fnref:66" href="#fn:66"><sup>66</sup></a> </p> <ul><li>UNIX 93<a class="footnote-ref" id="fnref:67" href="#fn:67"><sup>67</sup></a></li> <li>UNIX 95 - the mark for systems conforming to version 1 of the SUS<a class="footnote-ref" id="fnref:68" href="#fn:68"><sup>68</sup></a></li> <li>UNIX 98 - the mark for systems conforming to version 2 of the SUS<a class="footnote-ref" id="fnref:69" href="#fn:69"><sup>69</sup></a></li> <li>UNIX 03 - the mark for systems conforming to version 3 of the SUS<a class="footnote-ref" id="fnref:70" href="#fn:70"><sup>70</sup></a></li> <li>UNIX V7 - the mark for systems conforming to version 4 of the SUS (including Corrigenda)<a class="footnote-ref" id="fnref:71" href="#fn:71"><sup>71</sup></a><a class="footnote-ref" id="fnref:72" href="#fn:72"><sup>72</sup></a></li></ul> <h2 id="compliance">Compliance</h2> <table><tbody><tr><th>Product</th><th>Vendor</th><th>Architecture</th><th>UNIX V7<a class="footnote-ref" id="fnref:73" href="#fn:73"><sup>73</sup></a></th><th>UNIX 03<a class="footnote-ref" id="fnref:74" href="#fn:74"><sup>74</sup></a></th><th>UNIX 98<a class="footnote-ref" id="fnref:75" href="#fn:75"><sup>75</sup></a></th><th>UNIX 95<a class="footnote-ref" id="fnref:76" href="#fn:76"><sup>76</sup></a></th><th>UNIX 93<a class="footnote-ref" id="fnref:77" href="#fn:77"><sup>77</sup></a></th></tr><tr><td><a href="/facts/IBM_AIX/cRWERua2">AIX</a></td><td><a href="/facts/IBM_Corporation/QszA7nwd">IBM Corporation</a></td><td><a href="/facts/Power_ISA/GLy1WS0m">POWER processors</a></td><td>Yes</td><td>Yes</td><td>No</td><td>No</td><td>No</td></tr><tr><td><a href="/facts/HP-UX/hIvLDdJF">HP-UX</a></td><td><a href="/facts/Hewlett_Packard_Enterprise/d9NbClDt">Hewlett Packard Enterprise</a></td><td><a href="/facts/IA-64/m6egpGno">IA-64</a>, <a href="/facts/PA-RISC/gjDs1HEh">PA-RISC</a></td><td>No</td><td>Yes</td><td>No</td><td>No</td><td>No</td></tr><tr><td><a href="/facts/MacOS/Y93vVpTm">macOS</a></td><td><a href="/facts/Apple_Inc./oTJYta3k">Apple</a></td><td><a href="/facts/X86-64/cyWvUFlP">x86-64</a>, <a href="/facts/ARM64/bauXRos7">ARM64</a></td><td>No</td><td>Yes</td><td>No</td><td>No</td><td>No</td></tr><tr><td><a href="/facts/SCO_OpenServer/MuIplPGX">OpenServer</a></td><td><a href="/facts/Xinuos/wbtFwqgY">Xinuos</a></td><td><a href="/facts/IA-32/7yTv1aHH">IA-32</a></td><td>No</td><td>No</td><td>No</td><td>No</td><td>Yes</td></tr><tr><td><a href="/facts/UnixWare/L0q19BlL">UnixWare</a></td><td><a href="/facts/Xinuos/wbtFwqgY">Xinuos</a></td><td><a href="/facts/IA-32/7yTv1aHH">IA-32</a></td><td>No</td><td>No</td><td>No</td><td>Yes</td><td>No</td></tr><tr><td><a href="/facts/Z/OS/amLCAlgV">z/OS</a></td><td><a href="/facts/IBM_Corporation/QszA7nwd">IBM Corporation</a></td><td><a href="/facts/Z/Architecture/FcKYkGn9">z/Architecture</a></td><td>No</td><td>No</td><td>No</td><td>Yes</td><td>No</td></tr></tbody></table> <h3>Currently registered UNIX systems</h3> <h4>AIX</h4> <p><a href="/facts/IBM_AIX/cRWERua2">AIX</a> version 7, at either 7.1 TL5 (or later) or 7.2 TL2 (or later) are registered as UNIX 03 compliant.<a class="footnote-ref" id="fnref:78" href="#fn:78"><sup>78</sup></a> AIX version 7, at 7.2 TL5 (or later) are registered as UNIX V7 compliant.<a class="footnote-ref" id="fnref:79" href="#fn:79"><sup>79</sup></a> Older versions were previously certified to the UNIX 95 and UNIX 98 marks.<a class="footnote-ref" id="fnref:80" href="#fn:80"><sup>80</sup></a> </p> <h4>HP-UX</h4> <p><a href="/facts/HP-UX/hIvLDdJF">HP-UX</a> 11i V3 Release B.11.31 is registered as UNIX 03 compliant. Previous releases were registered as UNIX 95.<a class="footnote-ref" id="fnref:81" href="#fn:81"><sup>81</sup></a> </p> <h4>macOS</h4> <p><a href="/facts/Apple_Inc./oTJYta3k">Apple</a> <a href="/facts/MacOS/Y93vVpTm">macOS</a> (formerly known as Mac OS X and OS X) is registered as UNIX 03 compliant.<a class="footnote-ref" id="fnref:82" href="#fn:82"><sup>82</sup></a> The first version registered was <a href="/facts/Mac_OS_X_Leopard/UmXw4H5x">Mac OS X 10.5 Leopard</a>, certified on October 26, 2007 (on x86 systems).<a class="footnote-ref" id="fnref:83" href="#fn:83"><sup>83</sup></a><a class="footnote-ref" id="fnref:84" href="#fn:84"><sup>84</sup></a> All versions of <a href="/facts/MacOS/Y93vVpTm">macOS</a> from Mac OS X Leopard to <a href="/facts/MacOS_Catalina/B2RE5fGd">macOS 10.15 Catalina</a>, except for <a href="/facts/Mac_OS_X_Lion/CHyxXg8X">OS X Lion</a>,<a class="footnote-ref" id="fnref:85" href="#fn:85"><sup>85</sup></a> have been registered on Intel-based systems, and all versions from <a href="/facts/MacOS_Big_Sur/RV8pCK4d">macOS 11 Big Sur</a>, the successor to macOS Catalina, up to <a href="/facts/MacOS_Sonoma/FCrCcpx0">macOS 14 Sonoma</a> have been registered on both x86-64 and ARM64 systems.<a class="footnote-ref" id="fnref:86" href="#fn:86"><sup>86</sup></a> </p> <h4>Xinuos</h4> <p><a href="/facts/UnixWare/L0q19BlL">UnixWare</a> 7.1.3 and later is registered as UNIX 95 compliant. <a href="/facts/OpenServer/MuIplPGX">OpenServer</a> 5 and 6 are registered as UNIX 93 compliant. </p> <h4>z/OS</h4> <p>IBM <a href="/facts/Z/OS/amLCAlgV">z/OS</a> 1.2 and higher is registered as UNIX 95 compliant. z/OS 1.9, released on September 28, 2007, and subsequent releases "better align" with UNIX 03.<a class="footnote-ref" id="fnref:87" href="#fn:87"><sup>87</sup></a> </p> <h3>Previously registered UNIX systems</h3> <h4>EulerOS</h4> <p><a href="/facts/EulerOS/4PRCpS9G">EulerOS</a> 2.0 for the <a href="/facts/X86-64/cyWvUFlP">x86-64</a> architecture was registered as UNIX 03 compliant.<a class="footnote-ref" id="fnref:88" href="#fn:88"><sup>88</sup></a><a class="footnote-ref" id="fnref:89" href="#fn:89"><sup>89</sup></a> The UNIX 03 conformance statement shows that the standard C compiler is from the <a href="/facts/GNU_Compiler_Collection/t07jh01k">GNU Compiler Collection</a> (gcc), and that the system is a <a href="/facts/Linux_distribution/0vVl4N4f">Linux distribution</a> of the <a href="/facts/Red_Hat_Enterprise_Linux/6Cekx2ed">Red Hat Enterprise Linux</a> family.<a class="footnote-ref" id="fnref:90" href="#fn:90"><sup>90</sup></a> The UNIX 03 certification expired in September 2022 and has not been renewed.<a class="footnote-ref" id="fnref:91" href="#fn:91"><sup>91</sup></a> </p> <h4>FTX</h4> <p><a href="/facts/Stratus_Technologies/Hy4RpnW3">Stratus Technologies</a> DNCP Series servers running FTX Release 3 were registered as UNIX 93 compliant.<a class="footnote-ref" id="fnref:92" href="#fn:92"><sup>92</sup></a> </p> <h4>Inspur K-UX</h4> <p><a href="/facts/Inspur_K-UX/RPsRgWLJ">Inspur K-UX</a> 2.0 and 3.0 for the <a href="/facts/X86-64/cyWvUFlP">x86-64</a> architecture were certified as UNIX 03 compliant.<a class="footnote-ref" id="fnref:93" href="#fn:93"><sup>93</sup></a><a class="footnote-ref" id="fnref:94" href="#fn:94"><sup>94</sup></a> The UNIX 03 conformance statement for Inspur K-UX 2.0 and 3.0 shows that the standard C compiler is from the <a href="/facts/GNU_Compiler_Collection/t07jh01k">GNU Compiler Collection</a> (gcc), and that the system is a <a href="/facts/Linux_distribution/0vVl4N4f">Linux distribution</a> of the <a href="/facts/Red_Hat/5rhmBLBa">Red Hat</a> family.<a class="footnote-ref" id="fnref:95" href="#fn:95"><sup>95</sup></a> </p> <h4>IRIX</h4> <p><a href="/facts/Silicon_Graphics/DKvkrfLX">SGI</a> <a href="/facts/IRIX/vK9rSatM">IRIX</a> 6.5 was registered as UNIX 95 compliant.<a class="footnote-ref" id="fnref:96" href="#fn:96"><sup>96</sup></a> </p> <h4>OS/390</h4> <p>IBM <a href="/facts/OS/390/9buuv7H9">OS/390</a> was registered as UNIX 95 compliant beginning with the V2R4 release.<a class="footnote-ref" id="fnref:97" href="#fn:97"><sup>97</sup></a> </p> <h4>Reliant UNIX</h4> <p>The last <a href="/facts/Reliant_UNIX/VbdESF6k">Reliant UNIX</a> versions were registered as UNIX 95 compliant (XPG4 hard branding). </p> <h4>Solaris</h4> <p><a href="/facts/Solaris_(operating_system)/KPfT98EJ">Solaris</a> 11.4 was previously registered as UNIX v7 compliant in 2018.<a class="footnote-ref" id="fnref:98" href="#fn:98"><sup>98</sup></a> Solaris 11 and Solaris 10 were registered as UNIX 03 compliant on <a href="/facts/32-bit/TDMVce8s">32-bit</a> and <a href="/facts/64-bit/AgvkQHkM">64-bit</a> <a href="/facts/X86/Kypq5fgu">x86</a> (<a href="/facts/X86-64/cyWvUFlP">X86-64</a>) and <a href="/facts/SPARC/m7KhEtET">SPARC</a> systems. Solaris 8 and 9 were registered as UNIX 98 compliant on <a href="/facts/32-bit/TDMVce8s">32-bit</a> <a href="/facts/X86/Kypq5fgu">x86</a> and <a href="/facts/SPARC/m7KhEtET">SPARC</a> systems; 64-bit x86 systems were not supported. Solaris 2.4 and 2.6, on both x86 and SPARC, were certified to the UNIX 93 and UNIX 95 marks respectively.<a class="footnote-ref" id="fnref:99" href="#fn:99"><sup>99</sup></a> </p><p>Solaris 2.5.1 was also registered as UNIX 95 compliant on the <a href="/facts/PReP/XUnqDKvv">PReP</a> <a href="/facts/PowerPC/DqmM9y50">PowerPC</a> platform in 1996, but the product was withdrawn before more than a few dozen copies had been sold.<a class="footnote-ref" id="fnref:100" href="#fn:100"><sup>100</sup></a> </p> <h4>Tru64 UNIX</h4> <p><a href="/facts/Tru64_UNIX/J4tMy7uA">Tru64 UNIX</a> V5.1A and later were registered as UNIX 98 compliant.<a class="footnote-ref" id="fnref:101" href="#fn:101"><sup>101</sup></a> </p> <h4>Other</h4> <p>Other operating systems previously registered as UNIX 95 or UNIX 93 compliant: </p> <ul><li><a href="/facts/NCR_Corporation/1vfttHoo">NCR</a> UNIX SVR4</li> <li><a href="/facts/NEC/YnlUsMBA">NEC</a> UX/4800</li></ul> <h3>Non-registered Unix-like systems</h3> <p>Developers and vendors of <a href="/facts/Unix-like/YAKrAxzd">Unix-like</a> operating systems such as <a href="/facts/Linux/9FvCKSTq">Linux</a>, <a href="/facts/FreeBSD/RKsFTm7F">FreeBSD</a>, and <a href="/facts/MINIX/dzdlkN6g">MINIX</a> typically do not certify their distributions and do not install full POSIX utilities by default. </p><p>For Linux, <a href="/facts/Pax_(command)/dPXpJaas">pax</a> command is usually not installed; furthermore, pax command packages available for Linux often lack pax file format support required by POSIX.<a class="footnote-ref" id="fnref:102" href="#fn:102"><sup>102</sup></a> Sometimes, SUS compliance can be improved by installing additional packages, but very few Linux systems can be configured to be completely conformant. The <a href="/facts/Linux_Standard_Base/8Hq3tPJM">Linux Standard Base</a> was formed in 2001 as an attempt to standardize the internal structures of Linux-based systems for increased compatibility. It is based on the POSIX specifications, the Single UNIX Specification, and other open standards, and also extends them in several areas; but there are some conflicts between the LSB and the POSIX standards.<a class="footnote-ref" id="fnref:103" href="#fn:103"><sup>103</sup></a><a class="footnote-ref" id="fnref:104" href="#fn:104"><sup>104</sup></a> Few <a href="/facts/Linux_distribution/0vVl4N4f">Linux distributions</a> actually go through certification as LSB compliant.<a class="footnote-ref" id="fnref:105" href="#fn:105"><sup>105</sup></a> </p><p><a href="/facts/Darwin_(operating_system)/DogI3ptd">Darwin</a>, the open source subset of macOS, has behavior that can be set to comply with UNIX 03.<a class="footnote-ref" id="fnref:106" href="#fn:106"><sup>106</sup></a><a class="footnote-ref" id="fnref:107" href="#fn:107"><sup>107</sup></a> Darwin uses a 4.4BSD-derived pax command,<a class="footnote-ref" id="fnref:108" href="#fn:108"><sup>108</sup></a> which lacks multibyte support for filenames. </p><p>FreeBSD previously had a "C99 and POSIX Conformance Project" which aimed for compliance with a subset of the Single UNIX Specification, and documentation where there were differences.<a class="footnote-ref" id="fnref:109" href="#fn:109"><sup>109</sup></a> FreeBSD pax command, derived from 4.4BSD, does not fully support pax file format.<a class="footnote-ref" id="fnref:110" href="#fn:110"><sup>110</sup></a> pax and ustar in-archive format use the same with slightly different defaults (5120 block size vs 10240 block size);<a class="footnote-ref" id="fnref:111" href="#fn:111"><sup>111</sup></a> however, FreeBSD's pax lacks the extended PAX headers used for extended character set support. FreeBSD man pages sometimes indicate deviations from POSIX and thus SUS in their STANDARDS sections.<a class="footnote-ref" id="fnref:112" href="#fn:112"><sup>112</sup></a> </p><p>OpenBSD man pages sometimes indicate deviations from POSIX and thus SUS in their STANDARDS sections.<a class="footnote-ref" id="fnref:113" href="#fn:113"><sup>113</sup></a><a class="footnote-ref" id="fnref:114" href="#fn:114"><sup>114</sup></a> </p><p>MINIX pax command does not support pax file format<a class="footnote-ref" id="fnref:115" href="#fn:115"><sup>115</sup></a> and thereby fails POSIX.1-2001. </p> <h2 id="external-links">External links</h2> <a href="https://pubs.opengroup.org/onlinepubs/9799919799/">POSIX.1-2024 online version</a> <h2 id="see-also">See also</h2> <ul><li><a href="/facts/List_of_Unix_commands/EEuIsUx9">List of Unix commands</a></li> <li><a href="/facts/Functional_specification/8TVokFw6">Functional specification</a></li> <li><a href="/facts/Open_standard/RGvhGQVI">Open standard</a></li> <li><a href="/facts/Open_system_(computing)/tVwr9W6r">Open system (computing)</a></li> <li><a href="/facts/POSIX/mQkSt234">POSIX</a></li> <li><a href="/facts/Manual_page_(Unix)/S2yYjy0J">UNIX manual</a></li> <li><a href="/facts/Unix_wars/qn70n7IA">Unix wars</a></li></ul> <h2 id="external-links">External links</h2> <ul><li>Andrew Josey (June 8, 2020). <a href="https://www.opengroup.org/austin/papers/single_unix_faq.html">"Single UNIX Specification Frequently Asked Questions"</a>. <i>opengroup.org</i>. 1.12.</li> <li><a href="https://unix.org/what_is_unix/single_unix_specification.html">The Single UNIX Specification</a>, unix.org</li> <li>Single UNIX Specification, Version 1 <ul><li><a href="https://pubs.opengroup.org/onlinepubs/009656599/toc.pdf">X/Open CAE Specification System Interface Definitions, Issue 4, Version 2</a>, 1994, opengroup.org</li> <li><a href="https://pubs.opengroup.org/onlinepubs/9695969499/toc.pdf">X/Open CAE Specification System Interfaces and Headers, Issue 4, Version 2</a>, 1994, opengroup.org</li> <li><a href="https://pubs.opengroup.org/onlinepubs/009656399/toc.pdf">X/Open CAE Specification Commands and Utilities, Issue 4, Version 2</a>, 1994, opengroup.org</li> <li><a href="https://pubs.opengroup.org/onlinepubs/009656199/toc.pdf">X/Open CAE Specification Networking Services, Issue 4</a>, 1994, opengroup.org</li></ul></li> <li><a href="https://publications.opengroup.org/c43x">Single UNIX® Specification, Version 1 Document Set (UNIX 95)</a>, opengroup.org – requires login to download</li> <li><a href="https://pubs.opengroup.org/onlinepubs/7908799/index.html">The Single UNIX Specification, Version 2</a>, 1997, opengroup.org</li> <li><a href="https://pubs.opengroup.org/onlinepubs/009695399/">The Open Group Base Specifications Issue 6</a>, 2004, opengroup.org</li> <li><a href="https://pubs.opengroup.org/onlinepubs/9699919799.2008edition/">The Open Group Base Specifications Issue 7, 2008 edition</a>, opengroup.org</li> <li><a href="https://pubs.opengroup.org/onlinepubs/9699919799.2013edition/">The Open Group Base Specifications Issue 7, 2013 edition</a>, opengroup.org</li> <li><a href="https://pubs.opengroup.org/onlinepubs/9699919799.2016edition/">The Open Group Base Specifications Issue 7, 2016 edition</a>, opengroup.org</li> <li><a href="https://pubs.opengroup.org/onlinepubs/9699919799.2018edition/">The Open Group Base Specifications Issue 7, 2018 edition</a>, opengroup.org</li> <li><a href="https://pubs.opengroup.org/onlinepubs/9699919799/">The Open Group Base Specifications Issue 7</a>, opengroup.org – latest edition</li> <li><a href="https://publications.opengroup.org/standards/unix/t101">Single UNIX Specification, Version 4, 2018 Edition</a>, opengroup.org</li> <li><a href="https://pubs.opengroup.org/onlinepubs/009638999/toc.pdf">X/Open Curses, Issue 4, Version 2</a>, 1996, opengroup.org</li> <li><a href="https://pubs.opengroup.org/onlinepubs/9699909599/toc.pdf">X/Open Curses, Issue 7</a>, 2009, opengroup.org</li> <li><a href="https://pubs.opengroup.org/onlinepubs/7899949299/toc.pdf">POSIX Technical Corrigendum 1</a>, 1003.1-2001/Cor 1-2001, opengroup.org</li> <li><a href="https://publications.opengroup.org/u130">Single UNIX Specification, Version 4 Technical Corrigendum No. 1</a>, IEEE Std 1003.1-2008/Cor 1-2013, opengroup.org</li> <li><a href="https://publications.opengroup.org/u160">Single UNIX Specification, Version 4 Technical Corrigendum No. 2</a>, IEEE Std 1003.1-2008/Cor 2-2016, opengroup.org</li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>"Questions & Answers". unix.org. <a href="https://unix.org/questions_answers.html" target="_blank">https://unix.org/questions_answers.html</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>"The UNIX Standard". The Open Group. August 27, 2018. <a href="https://www.opengroup.org/membership/forums/platform/unix" target="_blank">https://www.opengroup.org/membership/forums/platform/unix</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>"Single UNIX Specification, Version 4, 2018 Edition". The Open Group. <a href="https://publications.opengroup.org/standards/unix/t101" target="_blank">https://publications.opengroup.org/standards/unix/t101</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>Kelty, Christopher M. "Conceiving Open Systems" (PDF). kelty.org. <a href="https://kelty.org/or/papers/Kelty_WULP_Conceiving_2009.pdf" target="_blank">https://kelty.org/or/papers/Kelty_WULP_Conceiving_2009.pdf</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>Standards Conformance Guide (PDF). SunSoft. November 1995. <a href="https://docs.oracle.com/cd/E19641-01/802-1953/802-1953.pdf" target="_blank">https://docs.oracle.com/cd/E19641-01/802-1953/802-1953.pdf</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>System V Interface Definition. 1985. ASIN B000KF6SCE. <a href="https://books.google.com/books?id=QcG4wAEACAAJ" target="_blank">https://books.google.com/books?id=QcG4wAEACAAJ</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> <li id="fn:7"><p>Raymond, Eric S. (September 19, 2003). "Standards and the Unix Wars". The Art of UNIX Programming. <a href="/wiki/Eric_S._Raymond" target="_blank">/wiki/Eric_S._Raymond</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></p></li> <li id="fn:8"><p>Raymond, Eric S. (September 19, 2003). "Standards and the Unix Wars". The Art of UNIX Programming. <a href="/wiki/Eric_S._Raymond" target="_blank">/wiki/Eric_S._Raymond</a> <a href="#fnref:8" class="footnote-back-ref">↩</a></p></li> <li id="fn:9"><p>Stevens, W. Richard; Fenner, Bill; Rudoff, Andrew M. (2003). Unix Network Programming, Volume 1: The Sockets Networking API (3rd ed.). Addison-Wesley Professional. ISBN 978-0131411555. OCLC 53867239. <a href="978-0131411555" target="_blank">978-0131411555</a> <a href="#fnref:9" class="footnote-back-ref">↩</a></p></li> <li id="fn:10"><p>Raymond, Eric S. (September 19, 2003). "Standards and the Unix Wars". The Art of UNIX Programming. <a href="/wiki/Eric_S._Raymond" target="_blank">/wiki/Eric_S._Raymond</a> <a href="#fnref:10" class="footnote-back-ref">↩</a></p></li> <li id="fn:11"><p>"The Single UNIX Specification". unix.org. <a href="https://unix.org/what_is_unix/single_unix_specification.html" target="_blank">https://unix.org/what_is_unix/single_unix_specification.html</a> <a href="#fnref:11" class="footnote-back-ref">↩</a></p></li> <li id="fn:12"><p>"The UNIX System -- History and Timeline -- UNIX History". unix.org. <a href="https://unix.org/what_is_unix/history_timeline.html" target="_blank">https://unix.org/what_is_unix/history_timeline.html</a> <a href="#fnref:12" class="footnote-back-ref">↩</a></p></li> <li id="fn:13"><p>Fennessy, Quentin (October 12, 1993). "The name "UNIX" is now the property of X/Open". Newsgroup: comp.std.unix. <a href="https://groups.google.com/g/comp.std.unix/c/Jblvq9RejzI/m/ypx8LcZjBmEJ" target="_blank">https://groups.google.com/g/comp.std.unix/c/Jblvq9RejzI/m/ypx8LcZjBmEJ</a> <a href="#fnref:13" class="footnote-back-ref">↩</a></p></li> <li id="fn:14"><p>"Frequently Asked Questions". unix.org. <a href="https://unix.org/questions_answers/faq.html" target="_blank">https://unix.org/questions_answers/faq.html</a> <a href="#fnref:14" class="footnote-back-ref">↩</a></p></li> <li id="fn:15"><p>"The Single UNIX Specification". unix.org. <a href="https://unix.org/what_is_unix/single_unix_specification.html" target="_blank">https://unix.org/what_is_unix/single_unix_specification.html</a> <a href="#fnref:15" class="footnote-back-ref">↩</a></p></li> <li id="fn:16"><p>"The Single UNIX Specification". unix.org. <a href="https://unix.org/what_is_unix/single_unix_specification.html" target="_blank">https://unix.org/what_is_unix/single_unix_specification.html</a> <a href="#fnref:16" class="footnote-back-ref">↩</a></p></li> <li id="fn:17"><p>"The Single UNIX Specification". unix.org. <a href="https://unix.org/what_is_unix/single_unix_specification.html" target="_blank">https://unix.org/what_is_unix/single_unix_specification.html</a> <a href="#fnref:17" class="footnote-back-ref">↩</a></p></li> <li id="fn:18"><p>X/Open CAE Specification System Interface Definitions, Issue 4, Version 2 (PDF). X/Open Company. 1994. <a href="https://pubs.opengroup.org/onlinepubs/009656599/toc.pdf" target="_blank">https://pubs.opengroup.org/onlinepubs/009656599/toc.pdf</a> <a href="#fnref:18" class="footnote-back-ref">↩</a></p></li> <li id="fn:19"><p>X/Open CAE Specification System Interfaces and Headers, Issue 4, Version 2 (PDF). X/Open Company. 1994. <a href="https://pubs.opengroup.org/onlinepubs/9695969499/toc.pdf" target="_blank">https://pubs.opengroup.org/onlinepubs/9695969499/toc.pdf</a> <a href="#fnref:19" class="footnote-back-ref">↩</a></p></li> <li id="fn:20"><p>X/Open CAE Specification Commands and Utilities, Issue 4, Version 2 (PDF). X/Open Company. 1994. <a href="https://pubs.opengroup.org/onlinepubs/009656399/toc.pdf" target="_blank">https://pubs.opengroup.org/onlinepubs/009656399/toc.pdf</a> <a href="#fnref:20" class="footnote-back-ref">↩</a></p></li> <li id="fn:21"><p>X/Open CAE Specification Networking Services, Issue 4 (PDF). X/Open Company. 1994. <a href="https://pubs.opengroup.org/onlinepubs/009656199/toc.pdf" target="_blank">https://pubs.opengroup.org/onlinepubs/009656199/toc.pdf</a> <a href="#fnref:21" class="footnote-back-ref">↩</a></p></li> <li id="fn:22"><p>"The Single UNIX Specification". unix.org. <a href="https://unix.org/what_is_unix/single_unix_specification.html" target="_blank">https://unix.org/what_is_unix/single_unix_specification.html</a> <a href="#fnref:22" class="footnote-back-ref">↩</a></p></li> <li id="fn:23"><p>"Single UNIX® Specification, Version 1 Document Set (UNIX 95)". opengroup.org. Retrieved May 25, 2021. <a href="https://publications.opengroup.org/c43x" target="_blank">https://publications.opengroup.org/c43x</a> <a href="#fnref:23" class="footnote-back-ref">↩</a></p></li> <li id="fn:24"><p>X/Open Curses, Issue 4, Version 2 (PDF). X/Open Company. 1996. ISBN 1-85912-171-3. <a href="1-85912-171-3" target="_blank">1-85912-171-3</a> <a href="#fnref:24" class="footnote-back-ref">↩</a></p></li> <li id="fn:25"><p>X/Open Curses, Issue 4. X/Open Company. 1995. ISBN 9781859120774. <a href="9781859120774" target="_blank">9781859120774</a> <a href="#fnref:25" class="footnote-back-ref">↩</a></p></li> <li id="fn:26"><p>Bozman, Jean S. (October 24, 1994). "X/Open test suites advance". Computerworld. Vol. 28, no. 43. p. 49. <a href="https://books.google.com/books?id=Ilp0BEVTY3gC&pg=PA49" target="_blank">https://books.google.com/books?id=Ilp0BEVTY3gC&pg=PA49</a> <a href="#fnref:26" class="footnote-back-ref">↩</a></p></li> <li id="fn:27"><p>"Open Brand - UNIX 95". The Open Group. <a href="https://www.opengroup.org/openbrand/register/xum4.htm" target="_blank">https://www.opengroup.org/openbrand/register/xum4.htm</a> <a href="#fnref:27" class="footnote-back-ref">↩</a></p></li> <li id="fn:28"><p>"How many APIS are there?". unix.org. <a href="https://unix.org/version3/howmany.html" target="_blank">https://unix.org/version3/howmany.html</a> <a href="#fnref:28" class="footnote-back-ref">↩</a></p></li> <li id="fn:29"><p>"The Single UNIX Specification". unix.org. <a href="https://unix.org/what_is_unix/single_unix_specification.html" target="_blank">https://unix.org/what_is_unix/single_unix_specification.html</a> <a href="#fnref:29" class="footnote-back-ref">↩</a></p></li> <li id="fn:30"><p>McCrea, Phil (April 1996). "Formation of 'The Open Group'". AUGGN: The Journal of AUUG Inc. 17 (2): 17–18. <a href="https://books.google.com/books?id=t_HcO8cY91IC&pg=PA17" target="_blank">https://books.google.com/books?id=t_HcO8cY91IC&pg=PA17</a> <a href="#fnref:30" class="footnote-back-ref">↩</a></p></li> <li id="fn:31"><p>Gaudin, Sharon (May 27, 1996). "WebCrusader may blaze wider trail for DCE users". Computerworld. Vol. 30, no. 22. p. 64. <a href="https://books.google.com/books?id=GTHir58nwGgC&pg=PT71" target="_blank">https://books.google.com/books?id=GTHir58nwGgC&pg=PT71</a> <a href="#fnref:31" class="footnote-back-ref">↩</a></p></li> <li id="fn:32"><p>"The Single UNIX Specification, Version 2". www.opengroup.org. <a href="https://www.opengroup.org/onlinepubs/7990989775/" target="_blank">https://www.opengroup.org/onlinepubs/7990989775/</a> <a href="#fnref:32" class="footnote-back-ref">↩</a></p></li> <li id="fn:33"><p>"The Open Group Announces Enhanced Single UNIX Specification" (Press release). The Open Group. March 12, 1997. Retrieved July 26, 2009. <a href="https://unix.org/version2/pr.html" target="_blank">https://unix.org/version2/pr.html</a> <a href="#fnref:33" class="footnote-back-ref">↩</a></p></li> <li id="fn:34"><p>"What's New in the Single UNIX Specification, Version 2". unix.org. <a href="https://unix.org/version2/whatsnew/login_whatsnew.html" target="_blank">https://unix.org/version2/whatsnew/login_whatsnew.html</a> <a href="#fnref:34" class="footnote-back-ref">↩</a></p></li> <li id="fn:35"><p>System Interface Definitions Issue 5 (PDF). The Open Group. <a href="https://pubs.opengroup.org/onlinepubs/9693999499/toc.pdf" target="_blank">https://pubs.opengroup.org/onlinepubs/9693999499/toc.pdf</a> <a href="#fnref:35" class="footnote-back-ref">↩</a></p></li> <li id="fn:36"><p>System Interfaces and Headers Issue 5 (PDF). The Open Group. <a href="https://pubs.opengroup.org/onlinepubs/009639399/toc.pdf" target="_blank">https://pubs.opengroup.org/onlinepubs/009639399/toc.pdf</a> <a href="#fnref:36" class="footnote-back-ref">↩</a></p></li> <li id="fn:37"><p>Commands and Utilities Issue 5 (PDF). The Open Group. <a href="https://pubs.opengroup.org/onlinepubs/009639599/toc.pdf" target="_blank">https://pubs.opengroup.org/onlinepubs/009639599/toc.pdf</a> <a href="#fnref:37" class="footnote-back-ref">↩</a></p></li> <li id="fn:38"><p>Networking Services (XNS) Issue 5 (PDF). The Open Group. May 14, 1997. ISBN 1-85912-165-9. <a href="1-85912-165-9" target="_blank">1-85912-165-9</a> <a href="#fnref:38" class="footnote-back-ref">↩</a></p></li> <li id="fn:39"><p>X/Open Curses, Issue 4, Version 2 (PDF). The Open Group. 1996. ISBN 1-85912-171-3. <a href="1-85912-171-3" target="_blank">1-85912-171-3</a> <a href="#fnref:39" class="footnote-back-ref">↩</a></p></li> <li id="fn:40"><p>"Open Brand - UNIX 98". X/Open Company. <a href="https://www.opengroup.org/openbrand/register/xxm0.htm" target="_blank">https://www.opengroup.org/openbrand/register/xxm0.htm</a> <a href="#fnref:40" class="footnote-back-ref">↩</a></p></li> <li id="fn:41"><p>"How many APIS are there?". unix.org. <a href="https://unix.org/version3/howmany.html" target="_blank">https://unix.org/version3/howmany.html</a> <a href="#fnref:41" class="footnote-back-ref">↩</a></p></li> <li id="fn:42"><p>"The Open Group announces completion of the joint revision to POSIX and the Single UNIX Specification" (Press release). The Open Group. January 30, 2002. Retrieved July 26, 2009. <a href="https://unix.org/version3/pr.html" target="_blank">https://unix.org/version3/pr.html</a> <a href="#fnref:42" class="footnote-back-ref">↩</a></p></li> <li id="fn:43"><p>"The Single UNIX Specification Version 3 - Overview". unix.org. <a href="https://unix.org/version3/overview.html" target="_blank">https://unix.org/version3/overview.html</a> <a href="#fnref:43" class="footnote-back-ref">↩</a></p></li> <li id="fn:44"><p>"Open Brand - UNIX 03". The Open Group. <a href="https://www.opengroup.org/openbrand/register/xym0.htm" target="_blank">https://www.opengroup.org/openbrand/register/xym0.htm</a> <a href="#fnref:44" class="footnote-back-ref">↩</a></p></li> <li id="fn:45"><p>"The Single UNIX Specification Version 3 - Overview". unix.org. <a href="https://unix.org/version3/overview.html" target="_blank">https://unix.org/version3/overview.html</a> <a href="#fnref:45" class="footnote-back-ref">↩</a></p></li> <li id="fn:46"><p>"How many APIS are there?". unix.org. <a href="https://unix.org/version3/howmany.html" target="_blank">https://unix.org/version3/howmany.html</a> <a href="#fnref:46" class="footnote-back-ref">↩</a></p></li> <li id="fn:47"><p>The Single UNIX Specification: The Authorized Guide to Version 3, 2nd Edition (PDF). The Open Group. <a href="https://pubs.opengroup.org/onlinepubs/9299959899/toc.pdf" target="_blank">https://pubs.opengroup.org/onlinepubs/9299959899/toc.pdf</a> <a href="#fnref:47" class="footnote-back-ref">↩</a></p></li> <li id="fn:48"><p>"The Open Group Base Specifications Issue 6". The Open Group. <a href="https://www.opengroup.org/onlinepubs/009695399/" target="_blank">https://www.opengroup.org/onlinepubs/009695399/</a> <a href="#fnref:48" class="footnote-back-ref">↩</a></p></li> <li id="fn:49"><p>"IEEE Std 1003.1, 2004 Edition". Retrieved July 26, 2009. <a href="https://unix.org/version3/ieee_std.html" target="_blank">https://unix.org/version3/ieee_std.html</a> <a href="#fnref:49" class="footnote-back-ref">↩</a></p></li> <li id="fn:50"><p>"IEEE Std 1003.1, 2004 Edition". Retrieved July 26, 2009. <a href="https://unix.org/version3/ieee_std.html" target="_blank">https://unix.org/version3/ieee_std.html</a> <a href="#fnref:50" class="footnote-back-ref">↩</a></p></li> <li id="fn:51"><p>"POSIX.1(5)". Oracle Solaris 11.2 Information Library. <a href="https://docs.oracle.com/cd/E36784_01/html/E36883/posix.1-5.html" target="_blank">https://docs.oracle.com/cd/E36784_01/html/E36883/posix.1-5.html</a> <a href="#fnref:51" class="footnote-back-ref">↩</a></p></li> <li id="fn:52"><p>"1.3.4 Feature Test Macros". The GNU C Library manual. The GNU Project. <a href="https://www.gnu.org/software/libc/manual/html_node/Feature-Test-Macros.html" target="_blank">https://www.gnu.org/software/libc/manual/html_node/Feature-Test-Macros.html</a> <a href="#fnref:52" class="footnote-back-ref">↩</a></p></li> <li id="fn:53"><p>POSIX Abstractions in Modern Operating Systems: The Old, the New, and the Missing. Eleventh European Conference on Computer Systems. doi:10.1145/2901318.2901350. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:53" class="footnote-back-ref">↩</a></p></li> <li id="fn:54"><p>"The Open Group Base Specifications Issue 7, 2018 edition". www.opengroup.org. <a href="https://www.opengroup.org/onlinepubs/9699919799/" target="_blank">https://www.opengroup.org/onlinepubs/9699919799/</a> <a href="#fnref:54" class="footnote-back-ref">↩</a></p></li> <li id="fn:55"><p>"Base Specifications, Issue 7". The Open Group. Retrieved July 26, 2009. <a href="https://www.opengroup.org/bookstore/catalog/c082.htm" target="_blank">https://www.opengroup.org/bookstore/catalog/c082.htm</a> <a href="#fnref:55" class="footnote-back-ref">↩</a></p></li> <li id="fn:56"><p>"The Austin Common Standards Revision Group". The Open Group. Retrieved July 26, 2009. <a href="https://www.opengroup.org/austin/" target="_blank">https://www.opengroup.org/austin/</a> <a href="#fnref:56" class="footnote-back-ref">↩</a></p></li> <li id="fn:57"><p>"Single UNIX Specification Version 4". The Open Group. <a href="https://unix.net/version4" target="_blank">https://unix.net/version4</a> <a href="#fnref:57" class="footnote-back-ref">↩</a></p></li> <li id="fn:58"><p>"The Single UNIX Specification Version 4 - Introduction". unix.org. <a href="https://unix.org/version4/overview.html" target="_blank">https://unix.org/version4/overview.html</a> <a href="#fnref:58" class="footnote-back-ref">↩</a></p></li> <li id="fn:59"><p>"The Single UNIX Specification Version 4 - Introduction". unix.org. <a href="https://unix.org/version4/overview.html" target="_blank">https://unix.org/version4/overview.html</a> <a href="#fnref:59" class="footnote-back-ref">↩</a></p></li> <li id="fn:60"><p>"Version 4 Interface Counts". unix.org. <a href="https://unix.org/version4/interfaces.html" target="_blank">https://unix.org/version4/interfaces.html</a> <a href="#fnref:60" class="footnote-back-ref">↩</a></p></li> <li id="fn:61"><p>"UNIX V7 Certification". unix.org. <a href="https://unix.org/unixv7.html" target="_blank">https://unix.org/unixv7.html</a> <a href="#fnref:61" class="footnote-back-ref">↩</a></p></li> <li id="fn:62"><p>"Base Specifications, Issue 7, 2018 Edition". The Open Group. Retrieved July 6, 2018. <a href="https://publications.opengroup.org/c181" target="_blank">https://publications.opengroup.org/c181</a> <a href="#fnref:62" class="footnote-back-ref">↩</a></p></li> <li id="fn:63"><p>"IEEE SA - IEEE/Open Group 1003.1-2017". IEEE. <a href="https://standards.ieee.org/ieee/1003.1/7101/" target="_blank">https://standards.ieee.org/ieee/1003.1/7101/</a> <a href="#fnref:63" class="footnote-back-ref">↩</a></p></li> <li id="fn:64"><p>Matzan, Jem (July 30, 2004). "Can GNU ever be Unix?". linux.com. <a href="https://www.linux.com/news/can-gnu-ever-be-unix/" target="_blank">https://www.linux.com/news/can-gnu-ever-be-unix/</a> <a href="#fnref:64" class="footnote-back-ref">↩</a></p></li> <li id="fn:65"><p>"UNIX(R) Certified Products - The Open Group official register of UNIX Certified Products". The Open Group. <a href="https://www.opengroup.org/openbrand/register/" target="_blank">https://www.opengroup.org/openbrand/register/</a> <a href="#fnref:65" class="footnote-back-ref">↩</a></p></li> <li id="fn:66"><p>"The Open Brand - The full register of certified products". The Open Group. <a href="https://www.opengroup.org/openbrand/register/index2.html" target="_blank">https://www.opengroup.org/openbrand/register/index2.html</a> <a href="#fnref:66" class="footnote-back-ref">↩</a></p></li> <li id="fn:67"><p>"The Open Brand Register, UNIX 93". The Open Group. <a href="https://www.opengroup.org/openbrand/register/xt.htm" target="_blank">https://www.opengroup.org/openbrand/register/xt.htm</a> <a href="#fnref:67" class="footnote-back-ref">↩</a></p></li> <li id="fn:68"><p>"The Open Brand Register, UNIX 95". The Open Group. <a href="https://www.opengroup.org/openbrand/register/xu.htm" target="_blank">https://www.opengroup.org/openbrand/register/xu.htm</a> <a href="#fnref:68" class="footnote-back-ref">↩</a></p></li> <li id="fn:69"><p>"The Open Brand Register, UNIX 98". The Open Group. <a href="https://www.opengroup.org/openbrand/register/xx.htm" target="_blank">https://www.opengroup.org/openbrand/register/xx.htm</a> <a href="#fnref:69" class="footnote-back-ref">↩</a></p></li> <li id="fn:70"><p>"The Open Brand Register, UNIX 03". The Open Group. <a href="https://www.opengroup.org/openbrand/register/xy.htm" target="_blank">https://www.opengroup.org/openbrand/register/xy.htm</a> <a href="#fnref:70" class="footnote-back-ref">↩</a></p></li> <li id="fn:71"><p>"The Open Brand Register, UNIX V7". The Open Group. <a href="https://www.opengroup.org/openbrand/register/xv7.htm" target="_blank">https://www.opengroup.org/openbrand/register/xv7.htm</a> <a href="#fnref:71" class="footnote-back-ref">↩</a></p></li> <li id="fn:72"><p>"The UNIX System -- UNIX V7 Certification". unix.org. <a href="https://unix.org/unixv7.html" target="_blank">https://unix.org/unixv7.html</a> <a href="#fnref:72" class="footnote-back-ref">↩</a></p></li> <li id="fn:73"><p>"The Open Brand Register, UNIX V7". The Open Group. <a href="https://www.opengroup.org/openbrand/register/xv7.htm" target="_blank">https://www.opengroup.org/openbrand/register/xv7.htm</a> <a href="#fnref:73" class="footnote-back-ref">↩</a></p></li> <li id="fn:74"><p>"The Open Brand Register, UNIX 03". The Open Group. <a href="https://www.opengroup.org/openbrand/register/xy.htm" target="_blank">https://www.opengroup.org/openbrand/register/xy.htm</a> <a href="#fnref:74" class="footnote-back-ref">↩</a></p></li> <li id="fn:75"><p>"The Open Brand Register, UNIX 98". The Open Group. <a href="https://www.opengroup.org/openbrand/register/xx.htm" target="_blank">https://www.opengroup.org/openbrand/register/xx.htm</a> <a href="#fnref:75" class="footnote-back-ref">↩</a></p></li> <li id="fn:76"><p>"The Open Brand Register, UNIX 95". The Open Group. <a href="https://www.opengroup.org/openbrand/register/xu.htm" target="_blank">https://www.opengroup.org/openbrand/register/xu.htm</a> <a href="#fnref:76" class="footnote-back-ref">↩</a></p></li> <li id="fn:77"><p>"The Open Brand Register, UNIX 93". The Open Group. <a href="https://www.opengroup.org/openbrand/register/xt.htm" target="_blank">https://www.opengroup.org/openbrand/register/xt.htm</a> <a href="#fnref:77" class="footnote-back-ref">↩</a></p></li> <li id="fn:78"><p>The Open Group. "UNIX 03, AIX". <a href="https://www.opengroup.org/openbrand/register/brand3637.htm" target="_blank">https://www.opengroup.org/openbrand/register/brand3637.htm</a> <a href="#fnref:78" class="footnote-back-ref">↩</a></p></li> <li id="fn:79"><p>The Open Group. "UNIX V7, AIX". <a href="https://www.opengroup.org/openbrand/register/brand3658.htm" target="_blank">https://www.opengroup.org/openbrand/register/brand3658.htm</a> <a href="#fnref:79" class="footnote-back-ref">↩</a></p></li> <li id="fn:80"><p>"The Open Brand - Register of Certified Products". Open Group. July 23, 2003. Archived from the original on August 2, 2003. Retrieved January 23, 2022. <a href="https://web.archive.org/web/20030802103246/http://www.opengroup.org/openbrand/register/" target="_blank">https://web.archive.org/web/20030802103246/http://www.opengroup.org/openbrand/register/</a> <a href="#fnref:80" class="footnote-back-ref">↩</a></p></li> <li id="fn:81"><p>"UNIX 2003 Standard Profile conformance". Hewlett-Packard. Archived from the original on July 27, 2014. Retrieved July 22, 2014. <a href="https://web.archive.org/web/20140727044600/http://h21007.www2.hp.com/portal/download/files/unprot/STK/HPUX_STK/impacts/i1071.html" target="_blank">https://web.archive.org/web/20140727044600/http://h21007.www2.hp.com/portal/download/files/unprot/STK/HPUX_STK/impacts/i1071.html</a> <a href="#fnref:81" class="footnote-back-ref">↩</a></p></li> <li id="fn:82"><p>"OS X for UNIX Users" (PDF). July 2011. <a href="https://images.apple.com/macosx/docs/OSX_for_UNIX_Users_TB_July2011.pdf" target="_blank">https://images.apple.com/macosx/docs/OSX_for_UNIX_Users_TB_July2011.pdf</a> <a href="#fnref:82" class="footnote-back-ref">↩</a></p></li> <li id="fn:83"><p>"Mac OS X Leopard - Technology - UNIX". Leopard Technology Overview. Apple Inc. Archived from the original on August 23, 2007. Retrieved June 11, 2007. Leopard is now an Open Brand UNIX 03 Registered Product, conforming to the SUSv3 and POSIX 1003.1 specifications for the C API, Shell Utilities, and Threads. <a href="https://web.archive.org/web/20070823040630/http://www.apple.com/macosx/leopard/technology/unix.html" target="_blank">https://web.archive.org/web/20070823040630/http://www.apple.com/macosx/leopard/technology/unix.html</a> <a href="#fnref:83" class="footnote-back-ref">↩</a></p></li> <li id="fn:84"><p>The Open Group. "Mac OS X Version 10.5 Leopard on Intel-based Macintosh computers certification". Retrieved June 12, 2007. <a href="https://www.opengroup.org/openbrand/register/brand3555.htm" target="_blank">https://www.opengroup.org/openbrand/register/brand3555.htm</a> <a href="#fnref:84" class="footnote-back-ref">↩</a></p></li> <li id="fn:85"><p>"Re: was OS X version 10.7 Lion UNIX 03 certified?". www.mail-archive.com. Archived from the original on April 29, 2020. Retrieved July 22, 2021. <a href="https://www.mail-archive.com/austin-group-l@opengroup.org/msg02006.html" target="_blank">https://www.mail-archive.com/austin-group-l@opengroup.org/msg02006.html</a> <a href="#fnref:85" class="footnote-back-ref">↩</a></p></li> <li id="fn:86"><p>"Open Brand". www.opengroup.org. Retrieved November 15, 2022. <a href="https://www.opengroup.org/openbrand/register/apple.htm" target="_blank">https://www.opengroup.org/openbrand/register/apple.htm</a> <a href="#fnref:86" class="footnote-back-ref">↩</a></p></li> <li id="fn:87"><p>z/OS Version 1 Release 9 Implementation (PDF) (First ed.). IBM. December 2007. pp. 4–5, 156–162. SG24-7427-00. Retrieved June 9, 2024. <a href="https://www.redbooks.ibm.com/redbooks/pdfs/sg247427.pdf" target="_blank">https://www.redbooks.ibm.com/redbooks/pdfs/sg247427.pdf</a> <a href="#fnref:87" class="footnote-back-ref">↩</a></p></li> <li id="fn:88"><p>"Huawei KunLun EulerOS 2.0 Operating System Passes UNIX Certification" (Press release). Huawei. September 9, 2016. Retrieved October 29, 2016. <a href="https://www.huawei.com/en/news/2016/9/huawei-kunlun-euleros-unix-certification" target="_blank">https://www.huawei.com/en/news/2016/9/huawei-kunlun-euleros-unix-certification</a> <a href="#fnref:88" class="footnote-back-ref">↩</a></p></li> <li id="fn:89"><p>The Open Group. "UNIX 03, EulerOS". <a href="https://www.opengroup.org/openbrand/register/brand3622.htm" target="_blank">https://www.opengroup.org/openbrand/register/brand3622.htm</a> <a href="#fnref:89" class="footnote-back-ref">↩</a></p></li> <li id="fn:90"><p>Peng Shen. "Huawei Conformance Statement: Commands and Utilities V4". The Open Group. Retrieved October 29, 2016. <a href="https://www.opengroup.org/csq/repository/norationale=1&noreferences=1&RID=huawei%252FCX1%252F1.html" target="_blank">https://www.opengroup.org/csq/repository/norationale=1&noreferences=1&RID=huawei%252FCX1%252F1.html</a> <a href="#fnref:90" class="footnote-back-ref">↩</a></p></li> <li id="fn:91"><p>The Open Group. "UNIX 03, EulerOS". <a href="https://www.opengroup.org/openbrand/register/brand3622.htm" target="_blank">https://www.opengroup.org/openbrand/register/brand3622.htm</a> <a href="#fnref:91" class="footnote-back-ref">↩</a></p></li> <li id="fn:92"><p>The Open Group. "The Open Brand - Register of Certified Products - UNIX 93". Archived from the original on October 5, 2016. <a href="https://web.archive.org/web/20161005132055/https://www.opengroup.org/openbrand/register/xt.htm" target="_blank">https://web.archive.org/web/20161005132055/https://www.opengroup.org/openbrand/register/xt.htm</a> <a href="#fnref:92" class="footnote-back-ref">↩</a></p></li> <li id="fn:93"><p>"The Open Brand Register of Certified Products". The Open Group. May 29, 2014. Retrieved May 29, 2014. <a href="https://www.opengroup.org/openbrand/register/brand3596.htm" target="_blank">https://www.opengroup.org/openbrand/register/brand3596.htm</a> <a href="#fnref:93" class="footnote-back-ref">↩</a></p></li> <li id="fn:94"><p>Xie Ruohong. "Inspur Conformance Statement". The Open Group. Retrieved December 8, 2015. <a href="https://www.opengroup.org/csq/repository/RID=inspur%252FXY1%252F1.html" target="_blank">https://www.opengroup.org/csq/repository/RID=inspur%252FXY1%252F1.html</a> <a href="#fnref:94" class="footnote-back-ref">↩</a></p></li> <li id="fn:95"><p>Xie Ruohong. "Inspur Conformance Statement: Commands and Utilities V4". The Open Group. Retrieved December 8, 2015. <a href="https://www.opengroup.org/csq/repository/RID=inspur%252FCX1%252F1.html" target="_blank">https://www.opengroup.org/csq/repository/RID=inspur%252FCX1%252F1.html</a> <a href="#fnref:95" class="footnote-back-ref">↩</a></p></li> <li id="fn:96"><p>"Silicon Graphics Inc - UNIX 95". Open Group. Archived from the original on August 2, 2003. <a href="https://web.archive.org/web/20030802154406/http://www.opengroup.org/openbrand/register/xu013.htm" target="_blank">https://web.archive.org/web/20030802154406/http://www.opengroup.org/openbrand/register/xu013.htm</a> <a href="#fnref:96" class="footnote-back-ref">↩</a></p></li> <li id="fn:97"><p>"Register of Open Branded Products (OS/390)". Open Group. June 19, 2003. Archived from the original on June 29, 2003. <a href="https://web.archive.org/web/20030629093915/http://www.opengroup.org/openbrand/register/xu009.htm" target="_blank">https://web.archive.org/web/20030629093915/http://www.opengroup.org/openbrand/register/xu009.htm</a> <a href="#fnref:97" class="footnote-back-ref">↩</a></p></li> <li id="fn:98"><p>"UNIX V7 - The Open Brand Register, Oracle Corporation". The Open Group. Archived from the original on January 14, 2020. Retrieved January 16, 2021. <a href="https://web.archive.org/web/20200114100431/https://www.opengroup.org/openbrand/register/brand3642.htm" target="_blank">https://web.archive.org/web/20200114100431/https://www.opengroup.org/openbrand/register/brand3642.htm</a> <a href="#fnref:98" class="footnote-back-ref">↩</a></p></li> <li id="fn:99"><p>"The Open Brand - Register of Certified Products". Open Group. July 23, 2003. Archived from the original on August 2, 2003. Retrieved January 23, 2022. <a href="https://web.archive.org/web/20030802103246/http://www.opengroup.org/openbrand/register/" target="_blank">https://web.archive.org/web/20030802103246/http://www.opengroup.org/openbrand/register/</a> <a href="#fnref:99" class="footnote-back-ref">↩</a></p></li> <li id="fn:100"><p>"Solaris 2.5.1". Archived from the original on September 12, 2005. <a href="https://web.archive.org/web/20050912194850/http://www.ocf.berkeley.edu/solaris/versions/solaris/2.5.1.html" target="_blank">https://web.archive.org/web/20050912194850/http://www.ocf.berkeley.edu/solaris/versions/solaris/2.5.1.html</a> <a href="#fnref:100" class="footnote-back-ref">↩</a></p></li> <li id="fn:101"><p>"Compaq Computer Corporation - UNIX 95". Open Group. Archived from the original on June 29, 2003. <a href="https://web.archive.org/web/20030629103042/http://www.opengroup.org/openbrand/register/xx001.htm" target="_blank">https://web.archive.org/web/20030629103042/http://www.opengroup.org/openbrand/register/xx001.htm</a> <a href="#fnref:101" class="footnote-back-ref">↩</a></p></li> <li id="fn:102"><p>"Bug #1329914 "No UNIX compatible pax implementation" : Bugs : RPM". Ubuntu bug tracker. June 13, 2014. <a href="https://bugs.launchpad.net/rpm/+bug/1329914" target="_blank">https://bugs.launchpad.net/rpm/+bug/1329914</a> <a href="#fnref:102" class="footnote-back-ref">↩</a></p></li> <li id="fn:103"><p>ISO/IEC TR 24715:2006 - Information technology -- Programming languages, their environments and system software interfaces -- Technical Report on the Conflicts between the ISO/IEC 9945 (POSIX) and the Linux Standard Base (ISO/IEC 23360). Retrieved October 15, 2011. <a href="https://www.iso.org/standard/38825.html" target="_blank">https://www.iso.org/standard/38825.html</a> <a href="#fnref:103" class="footnote-back-ref">↩</a></p></li> <li id="fn:104"><p>Josey, Andrew (August 29, 2005). "Conflicts between ISO/IEC 9945 (POSIX) and the Linux Standard Base". personal.opengroup.org (Unapproved Draft). <a href="https://personal.opengroup.org/~ajosey/tr20-08-2005.txt" target="_blank">https://personal.opengroup.org/~ajosey/tr20-08-2005.txt</a> <a href="#fnref:104" class="footnote-back-ref">↩</a></p></li> <li id="fn:105"><p>"Certified Products Product Directory". The Linux Foundation. Archived from the original on December 20, 2012. Retrieved December 9, 2015. <a href="https://archive.today/20121220223126/https://www.linuxbase.org/lsb-cert/productdir.php?by_lsb" target="_blank">https://archive.today/20121220223126/https://www.linuxbase.org/lsb-cert/productdir.php?by_lsb</a> <a href="#fnref:105" class="footnote-back-ref">↩</a></p></li> <li id="fn:106"><p>"Mac OS X Manual Page for compat(5) - Mac OS X 10.3". developer.apple.com. October 23, 2005. Archived from the original on March 10, 2009. Retrieved May 24, 2018. <a href="https://web.archive.org/web/20090310143649/http://developer.apple.com/documentation/Darwin/Reference/Manpages/man5/compat.5.html" target="_blank">https://web.archive.org/web/20090310143649/http://developer.apple.com/documentation/Darwin/Reference/Manpages/man5/compat.5.html</a> <a href="#fnref:106" class="footnote-back-ref">↩</a></p></li> <li id="fn:107"><p>"compat(5) Manual Page - macOS 10.9". developer.apple.com. June 30, 2010. Retrieved May 24, 2018. <a href="https://developer.apple.com/legacy/library/documentation/Darwin/Reference/ManPages/man5/compat.5.html" target="_blank">https://developer.apple.com/legacy/library/documentation/Darwin/Reference/ManPages/man5/compat.5.html</a> <a href="#fnref:107" class="footnote-back-ref">↩</a></p></li> <li id="fn:108"><p>"Mac OS X Manual Page for pax(1) - Mac OS X 10.3". developer.apple.com. October 23, 2005. Archived from the original on March 10, 2009. Retrieved November 25, 2023. <a href="https://web.archive.org/web/20090310143649/http://developer.apple.com/documentation/Darwin/Reference/Manpages/man1/pax.1.html" target="_blank">https://web.archive.org/web/20090310143649/http://developer.apple.com/documentation/Darwin/Reference/Manpages/man1/pax.1.html</a> <a href="#fnref:108" class="footnote-back-ref">↩</a></p></li> <li id="fn:109"><p>"FreeBSD C99 and POSIX conformance project". FreeBSD Project. Archived from the original on December 23, 2013. <a href="https://web.archive.org/web/20131223025351/http://www.freebsd.org/projects/c99/" target="_blank">https://web.archive.org/web/20131223025351/http://www.freebsd.org/projects/c99/</a> <a href="#fnref:109" class="footnote-back-ref">↩</a></p></li> <li id="fn:110"><p>pax(1) – FreeBSD General Commands Manual <a href="https://www.freebsd.org/cgi/man.cgi?query=pax&sektion=1" target="_blank">https://www.freebsd.org/cgi/man.cgi?query=pax&sektion=1</a> <a href="#fnref:110" class="footnote-back-ref">↩</a></p></li> <li id="fn:111"><p>"pax - portable archive interchange". The Open Group. <a href="https://pubs.opengroup.org/onlinepubs/9699919799/" target="_blank">https://pubs.opengroup.org/onlinepubs/9699919799/</a> <a href="#fnref:111" class="footnote-back-ref">↩</a></p></li> <li id="fn:112"><p>awk(1) – FreeBSD General Commands Manual <a href="https://www.freebsd.org/cgi/man.cgi?query=awk&sektion=1" target="_blank">https://www.freebsd.org/cgi/man.cgi?query=awk&sektion=1</a> <a href="#fnref:112" class="footnote-back-ref">↩</a></p></li> <li id="fn:113"><p>sh(1) – OpenBSD General Commands Manual <a href="https://man.openbsd.org/sh.1" target="_blank">https://man.openbsd.org/sh.1</a> <a href="#fnref:113" class="footnote-back-ref">↩</a></p></li> <li id="fn:114"><p>awk(1) – OpenBSD General Commands Manual <a href="https://man.openbsd.org/awk.1" target="_blank">https://man.openbsd.org/awk.1</a> <a href="#fnref:114" class="footnote-back-ref">↩</a></p></li> <li id="fn:115"><p>"pax(1)". man.minix3.org. <a href="https://man.minix3.org/cgi-bin/man.cgi?query=pax&apropos=0&sektion=0&manpath=Minix+3.3.0&arch=default&format=html" target="_blank">https://man.minix3.org/cgi-bin/man.cgi?query=pax&apropos=0&sektion=0&manpath=Minix+3.3.0&arch=default&format=html</a> <a href="#fnref:115" class="footnote-back-ref">↩</a></p></li> </ol>