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rsh originated as part of the BSD Unix Operating System , along with Rcp , as part of the Rlogin package on 4.2BSD in 1983 . rsh has since been ported to other operating systems. As described in the Rlogin article, the rsh Protocol is not Secure for network use, because it sends Unencrypted Information over the network, among other reasons. Some implementations also Authenticate by sending unencrypted Password s over the network. rsh has largely been replaced by the very similar Ssh (''secure shell'') program on untrusted networks like the Internet . As an example of rsh use, the following executes the command ''mkdir testdir'' as user ''remoteuser'' on the computer ''host.example.com'': rsh -l remoteuser host.example.com "mkdir testdir" After the command has finished rsh terminates. If no command is specified then rsh will log in on the remote system using Rlogin . The network location of the remote computer is looked up using the Domain Name System . rsh uses Well-known Port TCP 514. REFERENCES |
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