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<h2 id="use">Use</h2> <h3>Desktop integration</h3> <p>In Windows, the shell is presented in the <a href="/facts/Windows_Desktop/QG3MUJh7">desktop</a> via <a href="/facts/Windows_Terminal/vq1ftQbT">Windows Terminal</a> or on older versions via <a href="/facts/Windows_Console/p8vz2Cdk">Windows Console</a>. </p> <h3>Concurrent piping</h3> <p>In OS/2 and Windows, the shell supports <a href="/facts/Pipeline_(Unix)/EIhovuT2">pipes</a> to allow both sides of a pipeline to run concurrently. As a result, it is possible to redirect the <a href="/facts/Standard_error_stream/r92M7Wd4">standard error stream</a>. In contrast, COMMAND.COM uses temporary files, and runs the two sides serially, one after the other. </p> <h3>Command separator</h3> <p>Multiple commands can be included in a single line using the command separator & or &&.<a class="footnote-ref" id="fnref:9" href="#fn:9"><sup>9</sup></a> </p><p>With the & separator, a subsequent command is executed even if the previous command indicates an error.<a class="footnote-ref" id="fnref:10" href="#fn:10"><sup>10</sup></a> In the following example, each of the three commands is executed, one after the other, and regardless of their result code. </p> >CommandA & CommandB & CommandC <p>With the && separator, a command must complete successfully for the subsequent command to execute. In the following example, CommandB only executes if CommandA completes successfully, and CommandC only executes if CommandB also completes successfully. </p> >CommandA && CommandB && CommandC <h3>Command line limit</h3> <p>The shell limits the length of a command line which includes entered text, individual <a href="/facts/Environment_variable/WxkrJQpP">environment variables</a> that are inherited by other <a href="/facts/Process_(computing)/Vcq7EnUV">processes</a>, and all environment variable expansions<a class="footnote-ref" id="fnref:11" href="#fn:11"><sup>11</sup></a> On <a href="/facts/Windows_XP/IozrkAYS">Windows XP</a> and later, the maximum length is 8191 (213-1) characters. On earlier versions, such as <a href="/facts/Windows_2000/amJIt9gz">Windows 2000</a> or <a href="/facts/Windows_NT_4.0/EcKYxrkx">Windows NT 4.0</a>, the maximum length is 2047 (211-1) characters. </p> <h3>Escaping special characters</h3> <p>The shell reserves the following characters as <a href="/facts/Special_character/2RM5p7kg">special</a>:<a class="footnote-ref" id="fnref:12" href="#fn:12"><sup>12</sup></a> &<>[]{}^=;!'+,`~ and <a href="/facts/Whitespace_character/Q5xRIaSz">whitespace</a>. In some cases, an argument that contains such characters must be enclosed in double quotes to escape from the special character handling. For example: </p> >echo me & you me 'you' is not recognized as an internal or external command, operable program or batch file. >echo "me & you" "me & you" <h2 id="internal-commands">Internal commands</h2> <p>The following sections list <a href="/facts/Shell_builtin/9o8PrWpa">internal</a> <a href="/facts/Command_(computing)/zUrvQbFy">commands</a> for implementations of the shell on various operating systems. </p> <h3>OS/2</h3> <p>Internal commands in OS/2:<a class="footnote-ref" id="fnref:13" href="#fn:13"><sup>13</sup></a> </p> <ul><li><a href="/facts/Break_(command)/d72UqhJ3">break</a></li> <li><a href="/facts/Chcp_(command)/d72UqhJ3">chcp</a></li> <li><a href="/facts/Cd_(command)/GRT0BkeF">cd</a></li> <li><a href="/facts/Cd_(command)/GRT0BkeF">chdir</a></li> <li><a href="/facts/Cls_(command)/sXIFK8AY">cls</a></li> <li><a href="/facts/Copy_(command)/lC4UI6yN">copy</a></li> <li><a href="/facts/Date_(command)/LtoSMX4v">date</a></li> <li><a href="/facts/Del_(command)/8wLW0H0k">del</a></li> <li>detach</li> <li><a href="/facts/Dir_(command)/oosA54R0">dir</a></li> <li><a href="/facts/Dpath/a1QSEJhj">dpath</a></li> <li><a href="/facts/Echo_(command)/ue5jH01X">echo</a></li> <li><a href="/facts/Del_(command)/8wLW0H0k">erase</a></li> <li><a href="/facts/Exit_(command)/uWcVMq12">exit</a></li> <li><a href="/facts/FOR_(DOS_command)/cwV2nRzp">for</a></li> <li><a href="/facts/GOTO_(DOS_command)/V3bV9yVn">goto</a></li> <li><a href="/facts/IF_(DOS_command)/8gDQTqUD">if</a></li> <li><a href="/facts/Mkdir/YI42PsYJ">md</a></li> <li><a href="/facts/Mkdir/YI42PsYJ">mkdir</a></li> <li><a href="/facts/Path_(command)/d72UqhJ3">path</a></li> <li><a href="/facts/Pause_(command)/d72UqhJ3">pause</a></li> <li><a href="/facts/Prompt_(command)/d72UqhJ3">prompt</a></li> <li><a href="/facts/Rmdir/1dMYlg6C">rd</a></li> <li><a href="/facts/Rem_(command)/Q8hHFq8h">rem</a></li> <li><a href="/facts/Ren_(command)/qMNSpKv8">ren</a></li> <li><a href="/facts/Ren_(command)/qMNSpKv8">rename</a></li> <li><a href="/facts/Rmdir/1dMYlg6C">rmdir</a></li> <li><a href="/facts/Set_(command)/d72UqhJ3">set</a></li> <li><a href="/facts/Shift_(command)/d72UqhJ3">shift</a></li> <li><a href="/facts/Start_(command)/MSmngsRz">start</a></li> <li><a href="/facts/TIME_(command)/vnbkEU29">time</a></li> <li><a href="/facts/TYPE_(DOS_command)/qREHhkfg">type</a></li> <li><a href="/facts/Ver_(command)/x3Pz6hw2">ver</a></li> <li><a href="/facts/Verify_(command)/d72UqhJ3">verify</a></li> <li><a href="/facts/Vol_(command)/Im8LyqtX">vol</a></li></ul> <h3>Windows NT family</h3> <p>Internal commands in Windows NT and later:<a class="footnote-ref" id="fnref:14" href="#fn:14"><sup>14</sup></a> </p> <ul><li>assoc</li> <li><a href="/facts/Break_(command)/d72UqhJ3">break</a></li> <li><a href="/facts/Call_(command)/d72UqhJ3">call</a></li> <li><a href="/facts/Cd_(command)/GRT0BkeF">cd</a></li> <li><a href="/facts/Cd_(command)/GRT0BkeF">chdir</a></li> <li><a href="/facts/Cls_(command)/sXIFK8AY">cls</a></li> <li>color</li> <li><a href="/facts/Copy_(command)/lC4UI6yN">copy</a></li> <li><a href="/facts/Date_(command)/LtoSMX4v">date</a></li> <li><a href="/facts/Del_(command)/8wLW0H0k">del</a></li> <li><a href="/facts/Dir_(command)/oosA54R0">dir</a></li> <li><a href="/facts/Dpath/a1QSEJhj">dpath</a></li> <li><a href="/facts/Echo_(command)/ue5jH01X">echo</a></li> <li>endlocal</li> <li><a href="/facts/Del_(command)/8wLW0H0k">erase</a></li> <li><a href="/facts/Exit_(command)/uWcVMq12">exit</a></li> <li><a href="/facts/FOR_(DOS_command)/cwV2nRzp">for</a></li> <li><a href="/facts/Ftype/b7z2kKye">ftype</a></li> <li><a href="/facts/GOTO_(DOS_command)/V3bV9yVn">goto</a></li> <li><a href="/facts/Help_(command)/AouoTNSR">help</a></li> <li><a href="/facts/IF_(DOS_command)/8gDQTqUD">if</a></li> <li>keys</li> <li><a href="/facts/Mkdir/YI42PsYJ">md</a></li> <li><a href="/facts/Mkdir/YI42PsYJ">mkdir</a></li> <li><a href="/facts/Mklink/YcjbI05N">mklink</a></li> <li><a href="/facts/Move_(command)/uh2QlAf2">move</a></li> <li><a href="/facts/Path_(command)/d72UqhJ3">path</a></li> <li><a href="/facts/Pause_(command)/d72UqhJ3">pause</a></li> <li><a href="/facts/Pushd_and_popd/pdRB1ooC">popd</a></li> <li><a href="/facts/Prompt_(command)/d72UqhJ3">prompt</a></li> <li><a href="/facts/Pushd_and_popd/pdRB1ooC">pushd</a></li> <li><a href="/facts/Rmdir/1dMYlg6C">rd</a></li> <li><a href="/facts/Rem_(command)/Q8hHFq8h">rem</a></li> <li><a href="/facts/Ren_(command)/qMNSpKv8">ren</a></li> <li><a href="/facts/Ren_(command)/qMNSpKv8">rename</a></li> <li><a href="/facts/Rmdir/1dMYlg6C">rmdir</a></li> <li><a href="/facts/Set_(command)/d72UqhJ3">set</a></li> <li>setlocal</li> <li><a href="/facts/Shift_(command)/d72UqhJ3">shift</a></li> <li><a href="/facts/Start_(command)/MSmngsRz">start</a></li> <li><a href="/facts/TIME_(command)/vnbkEU29">time</a></li> <li><a href="/facts/Title_(command)/3kvqe0oQ">title</a></li> <li><a href="/facts/TYPE_(DOS_command)/qREHhkfg">type</a></li> <li><a href="/facts/Ver_(command)/x3Pz6hw2">ver</a></li> <li><a href="/facts/Verify_(command)/d72UqhJ3">verify</a></li> <li><a href="/facts/Vol_(command)/Im8LyqtX">vol</a></li></ul> <h3>Windows CE</h3> <p>Internal commands in Windows CE .NET 4.2,<a class="footnote-ref" id="fnref:15" href="#fn:15"><sup>15</sup></a> Windows CE 5.0<a class="footnote-ref" id="fnref:16" href="#fn:16"><sup>16</sup></a> and Windows Embedded CE 6.0:<a class="footnote-ref" id="fnref:17" href="#fn:17"><sup>17</sup></a> </p> <ul><li><a href="/facts/Attrib/t81evL39">attrib</a></li> <li>call</li> <li>cd</li> <li>chdir</li> <li>cls</li> <li>copy</li> <li>date</li> <li>del</li> <li>dir</li> <li>echo</li> <li>erase</li> <li>exit</li> <li>goto</li> <li><a href="/facts/Help_(command)/AouoTNSR">help</a></li> <li>if</li> <li>md</li> <li>mkdir</li> <li>move</li> <li>path</li> <li>pause</li> <li>prompt</li> <li><a href="/facts/Pwd/D8NjW3nY">pwd</a></li> <li>rd</li> <li>rem</li> <li>ren</li> <li>rename</li> <li>rmdir</li> <li>set</li> <li>shift</li> <li>start</li> <li>time</li> <li>title</li> <li>type</li></ul> <p>The <a href="/facts/Net_(command)/c2Flu1jC">net</a> command is available as an external command. </p> <h3>ReactOS</h3> <p>Internal commands in ReactOS:<a class="footnote-ref" id="fnref:18" href="#fn:18"><sup>18</sup></a> </p> <ul><li>?</li> <li><a href="/facts/Alias_(command)/BL5hJMxl">alias</a></li> <li>assoc</li> <li><a href="/facts/Beep_(command)/qGcVpG1J">beep</a></li> <li>call</li> <li>cd</li> <li>chdir</li> <li><a href="/facts/Choice_(command)/UAYlvKCz">choice</a></li> <li>cls</li> <li>color</li> <li>copy</li> <li>ctty</li> <li>date</li> <li>del</li> <li>delete</li> <li>delay</li> <li>dir</li> <li>dirs</li> <li>echo</li> <li>echos</li> <li>echoerr</li> <li>echoserr</li> <li>endlocal</li> <li>erase</li> <li>exit</li> <li>for</li> <li>free</li> <li>goto</li> <li><a href="/facts/History_(command)/W8m8CdFn">history</a></li> <li>if</li> <li>memory</li> <li>md</li> <li>mkdir</li> <li>mklink</li> <li>move</li> <li>path</li> <li>pause</li> <li>popd</li> <li>prompt</li> <li>pushd</li> <li>rd</li> <li>rmdir</li> <li>rem</li> <li>ren</li> <li>rename</li> <li>replace</li> <li>screen</li> <li>set</li> <li>setlocal</li> <li>shift</li> <li>start</li> <li>time</li> <li>timer</li> <li>title</li> <li>type</li> <li>ver</li> <li>verify</li> <li>vol</li></ul> <h2 id="comparison-with-commandcom">Comparison with COMMAND.COM</h2> <p>On Windows, cmd.exe provides various <a href="/facts/User_experience/0GF3UETu">user experience</a> enhancments as compared to COMMAND.COM, including: </p> <ul><li>More detailed error reporting for malformed commands than the generic COMMAND.COM "<a href="/facts/Bad_command_or_file_name/TeyyNmVs">Bad command or file name</a>". In OS/2, errors are reported in the chosen language of the system, their text being taken from the system message files. The <a href="/facts/Help_(command)/AouoTNSR">HELP</a> command can then be issued with the error message number to obtain further information.</li> <li>Supports using of arrow keys to scroll through command history. With COMMAND.COM, this functionality was only available in <a href="/facts/DR_DOS/GcCTKutW">DR DOS</a>; via <a href="/facts/HISTORY_(CONFIG.SYS_directive)/a1QSEJhj">HISTORY</a>) and later via an external component called <a href="/facts/DOSKEY/uVHm334Y">DOSKEY</a>.</li> <li>Adds <a href="/facts/Command-line_completion/MFaxnWrl">rotating command-line completion</a> for file and folder paths, where the user can cycle through results for the prefix using the <a href="/facts/Tab_key/gTyIhqBe">Tab</a> ↹, and ⇧ <a href="/facts/Shift_key/d0gXS7Jd">Shift</a>+Tab ↹ for reverse direction.</li> <li>Treats the <a href="/facts/Caret/LRV5MF7s">caret</a> character (^) as the <a href="/facts/Escape_character/pTSAozpa">escape character</a>; the character following it is to be taken literally. There are special characters in cmd.exe and COMMAND.COM that are meant to alter the behavior of the command line processor. The caret character forces the command line processor to interpret them literally.</li> <li>Supports delayed variable expansion with SETLOCAL EnableDelayedExpansion, allowing values of variables to be calculated at runtime instead of during parsing of script before execution (Windows 2000 and later), fixing DOS idioms that made using <a href="/facts/Control_structures/2XTDfErC">control structures</a> hard and complex.<a class="footnote-ref" id="fnref:19" href="#fn:19"><sup>19</sup></a> The extensions can be disabled, providing a stricter compatibility mode.</li> <li>The COMMAND.COM <a href="/facts/DELTREE/V1JjGh7f">DELTREE</a> command was merged into the <a href="/facts/RMDIR/1dMYlg6C">rd</a> command via the /S <a href="/facts/Switch_(command_line)/R9JpGmXQ">switch</a>.</li> <li>SetLocal and EndLocal commands limit the scope of changes to the environment. Changes made to the command line environment after SetLocal are local to the <a href="/facts/Batch_file/E6wMVSyb">batch file</a>. EndLocal restores the previous settings.<a class="footnote-ref" id="fnref:20" href="#fn:20"><sup>20</sup></a></li> <li>The call command allows subroutines within batch file. The COMMAND.COM CALL command only supports calling external batch files.</li> <li>File name parser extensions to the set command are comparable with <a href="/facts/C_shell/8XRuIg0K">C shell</a>.</li> <li>The set command can perform <a href="/facts/Expression_Evaluation/MPrMlYbE">expression evaluation</a>.</li> <li>An expansion of the <a href="/facts/For_loop/cwV2nRzp">for</a> command supports parsing files and arbitrary sets in addition to file names.</li> <li>The new <a href="/facts/PUSHD/pdRB1ooC">pushd</a> and <a href="/facts/POPD/pdRB1ooC">popd</a> commands provide access past navigated paths similar to forward and back buttons in a web browser or <a href="/facts/File_Explorer/oQW5yNnJ">File Explorer</a>.</li> <li>The conditional if command can perform <a href="/facts/Case_sensitivity/VS2eGDmY">case-insensitive</a> comparisons and numeric equality and inequality comparisons in addition to case-sensitive string comparisons. This was available in DR-DOS, but not in <a href="/facts/PC_DOS/ScsfqAwQ">PC DOS</a> or <a href="/facts/MS-DOS/fVrrz1uN">MS-DOS</a>.</li></ul> <h2 id="see-also">See also</h2> <ul><li><a href="/facts/Comparison_of_command_shells/VjrMgygY">Comparison of command shells</a></li> <li><a href="/facts/List_of_DOS_commands/d72UqhJ3">List of DOS commands</a></li></ul> <h2 id="further-reading">Further reading</h2> <ul><li>David Moskowitz; David Kerr (1994). <i>OS/2 2.11 Unleashed</i> (2nd ed.). <a href="/facts/Sams_Publishing/ClIg3VJt">Sams Publishing</a>. <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 978-0672304453.</li> <li>Stanek, William R. (2008). <i>Windows Command-Line Administrator's Pocket Consultant</i> (2nd ed.). <a href="/facts/Microsoft_Press/5bNASSu4">Microsoft Press</a>. <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 978-0735622623.</li></ul> <h2 id="external-links">External links</h2> Wikimedia Commons has media related to Windows Command Prompt. Wikibooks has a book on the topic of: <i>Windows Batch Scripting</i> <ul><li><a href="https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/windows-commands">"Command-line reference A-Z"</a>. <a href="/facts/Microsoft/nGIDDXdx">Microsoft</a>. April 26, 2023.</li> <li><a href="https://web.archive.org/web/20110902070525/http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/cmd.mspx">"Cmd"</a>. <i>Microsoft Windows XP Product Documentation</i>. <a href="/facts/Microsoft/nGIDDXdx">Microsoft</a>. Archived from <a href="http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/cmd.mspx">the original</a> on September 2, 2011. Retrieved May 24, 2006.</li> <li><a href="https://web.archive.org/web/20150422041137/http://windows.microsoft.com/en-us/windows/command-prompt-faq#1TC=windows-7">"Command Prompt: frequently asked questions"</a>. <i>windows Help</i>. <a href="/facts/Microsoft/nGIDDXdx">Microsoft</a>. Archived from <a href="http://windows.microsoft.com/en-us/windows/command-prompt-faq#1TC=windows-7">the original</a> on April 22, 2015. Retrieved April 20, 2015.</li> <li><a href="https://ss64.com/nt/">"An A–Z Index of the Windows CMD command line"</a>. SS64.com.</li> <li><a href="https://web.archive.org/web/20220111180551/https://windowscmd.com/">"Windows CMD.com – Hub of Windows Commands"</a>. windowscmd.com. Archived from <a href="https://windowscmd.com/">the original</a> on January 11, 2022. Retrieved January 4, 2022.</li> <li><a href="https://www.colorconsole.de/console/en/index.htm">Most important CMD commands in Windows - colorconsole.de</a></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>"Notes on using the default OS/2 command processor (CMD.EXE)". www.tavi.co.uk. <a href="http://www.tavi.co.uk/os2pages/cmd.html" target="_blank">http://www.tavi.co.uk/os2pages/cmd.html</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>"reactos/reactos". GitHub. December 4, 2021. <a href="https://github.com/reactos/reactos" target="_blank">https://github.com/reactos/reactos</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>"Command Processor Shell (Windows CE .NET 4.2)". Microsoft Docs. June 30, 2006. Archived from the original on August 31, 2022. <a href="https://docs.microsoft.com/en-us/previous-versions/windows/embedded/ms879823(v%3dmsdn.10)" target="_blank">https://docs.microsoft.com/en-us/previous-versions/windows/embedded/ms879823(v%3dmsdn.10)</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>"Command Processor Shell (Windows CE 5.0)". Microsoft Docs. September 14, 2012. Archived from the original on August 28, 2022. <a href="https://docs.microsoft.com/en-us/previous-versions/windows/embedded/aa453925(v%3dmsdn.10)" target="_blank">https://docs.microsoft.com/en-us/previous-versions/windows/embedded/aa453925(v%3dmsdn.10)</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>"Command Processor Shell (Windows Embedded CE 6.0)". Microsoft Docs. 2012. Archived from the original on September 5, 2022. <a href="https://docs.microsoft.com/en-us/previous-versions/windows/embedded/ee499728(v%3dwinembedded.60)" target="_blank">https://docs.microsoft.com/en-us/previous-versions/windows/embedded/ee499728(v%3dwinembedded.60)</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>Zachary, G. Pascal (1994). Showstopper! The Breakneck Race to Create Windows NT and the Next Generation at Microsoft. The Free Press. ISBN 0-02-935671-7. <a href="0-02-935671-7" target="_blank">0-02-935671-7</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> <li id="fn:7"><p>Douglas McConnaughey Boling (2001). Programming Microsoft Windows CE (2nd ed.). Microsoft Press. ISBN 978-0735614437. <a href="978-0735614437" target="_blank">978-0735614437</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></p></li> <li id="fn:8"><p>"reactos/reactos". GitHub. December 4, 2021. <a href="https://github.com/reactos/reactos" target="_blank">https://github.com/reactos/reactos</a> <a href="#fnref:8" class="footnote-back-ref">↩</a></p></li> <li id="fn:9"><p>"cmd". Microsoft Learn. September 12, 2023. Archived from the original on November 21, 2023. <a href="https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/cmd" target="_blank">https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/cmd</a> <a href="#fnref:9" class="footnote-back-ref">↩</a></p></li> <li id="fn:10"><p>"Command Redirection, Pipes - Windows CMD - SS64.com". ss64.com. Retrieved September 23, 2021. <a href="https://ss64.com/nt/syntax-redirection.html" target="_blank">https://ss64.com/nt/syntax-redirection.html</a> <a href="#fnref:10" class="footnote-back-ref">↩</a></p></li> <li id="fn:11"><p>Command prompt (Cmd.exe) command-line string limitation <a href="https://support.microsoft.com/en-us/help/830473/command-prompt-cmd-exe-command-line-string-limitation" target="_blank">https://support.microsoft.com/en-us/help/830473/command-prompt-cmd-exe-command-line-string-limitation</a> <a href="#fnref:11" class="footnote-back-ref">↩</a></p></li> <li id="fn:12"><p>"cmd". Microsoft Learn. September 12, 2023. 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