Editing Berkeley r-commands (section)

===rexec===
Like {{code|rsh}}, {{code|rexec}} enables the user to run shell commands on a remote computer. However, unlike the rsh server, the {{code|rexec}} server ({{code|rexecd}}) requires login: it authenticates users by reading the username and password (unencrypted) from the [[network socket]].<ref>{{cite web |url=http://www.manpagez.com/man/8/rexecd/ |title=rexecd(8) |website=manpagez.com |access-date=2018-03-03}}</ref> {{code|rexec}} uses TCP port 512.