Berkeley r-commands

<p>The Berkeley r-commands are a <a href="/facts/Software_suite/4TlRyeus">suite</a> of <a href="/facts/Computer_program/e38jH9N9">computer programs</a> designed to enable users of one <a href="/facts/Unix/0pNL2seI">Unix</a> system to <a href="/facts/Log_in/xNRgTVnV">log in</a> or issue <a href="/facts/Command_(computing)/zUrvQbFy">commands</a> to another <a href="/facts/Unix/0pNL2seI">Unix</a> computer via <a href="/facts/TCP/IP/KNkxtSpw">TCP/IP</a> <a href="/facts/Computer_network/3w5RM99p">computer network</a>. The r-commands were developed in 1982 by the <a href="/facts/Computer_Systems_Research_Group/a80JrPcR">Computer Systems Research Group</a> at the <a href="/facts/University_of_California,_Berkeley/MXVEjklr">University of California, Berkeley</a>, based on an early implementation of <a href="/facts/TCP/IP/KNkxtSpw">TCP/IP</a> (the <a href="/facts/Protocol_stack/Btj9FtwJ">protocol stack</a> of the <a href="/facts/Internet/Xw1rVvJU">Internet</a>).
</p><p>The CSRG incorporated the r-commands into their <a href="/facts/Unix/0pNL2seI">Unix</a> <a href="/facts/Operating_system/8XTuvMh2">operating system</a>, the <a href="/facts/Berkeley_Software_Distribution/XQKcURrh">Berkeley Software Distribution</a> (BSD). The r-commands premiered in BSD v4.1. Among the programs in the suite are: rcp (remote <a href="/facts/File_copying/QC4XWSIo">copy</a>), rexec (remote <a href="/facts/Execution_(computing)/1fyfGMFm">execution</a>), rlogin (remote <a href="/facts/Login/xNRgTVnV">login</a>), rsh (remote <a href="/facts/Shell_(computing)/Sa67elS7">shell</a>), rstat, ruptime, and rwho (remote <a href="/facts/Who_(Unix)/3XnJumIz">who</a>).
</p><p>The r-commands were a significant innovation, and became <i>de facto</i> standards for Unix operating systems. With wider public adoption of the Internet, their inherent security vulnerabilities became a problem, and beginning with the development of <a href="/facts/Secure_Shell/wjVRw5zv">Secure Shell</a> protocols and applications in 1995, its adoption entirely supplanted the deployment and use of r-commands (and <a href="/facts/Telnet/hxT0e85h">Telnet</a>) on networked systems.
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Overview<table><tbody><tr><th scope="col" colspan="2">Service</th><th scope="col" rowspan="2"><a href="/facts/Port_(computer_networking)/ygoHVKNC">Port</a></th><th scope="col" rowspan="2"><a href="/facts/Transport_protocol/UmIGUCeK">Transport</a></th><th scope="col" rowspan="2">Refs</th></tr><tr><th scope="col"><a href="/facts/Client_(computing)/u0wlVsWI">Client</a></th><th scope="col"><a href="/facts/Daemon_(computer_software)/bzuEVGGX">Daemon</a></th></tr><tr><td>rcp</td><td>rshd</td><td>514</td><td>TCP</td><td></td></tr><tr><td>rexec</td><td>rexecd</td><td>512</td><td>TCP</td><td></td></tr><tr><td>rlogin</td><td>rlogind</td><td>513</td><td>TCP</td><td></td></tr><tr><td>rsh</td><td>rshd</td><td>514</td><td>TCP</td><td></td></tr><tr><td>rstat</td><td>rstatd</td><td></td><td>UDP</td><td></td></tr><tr><td>ruptime</td><td rowspan="2">rwhod</td><td rowspan="2">513</td><td rowspan="2">UDP</td><td></td></tr><tr><td>rwho</td><td></td></tr></tbody></table>

Berkeley r-commands open-in-new

Berkeley r-commands