The Berkeley r-commands are a suite of programs that allow users of Unix systems to log in, run programs, retrieve files, and other such tasks over a computer network.
Some of the programs in the suite include:
- rcp (remote copy)
- rexec (remote execute)
- rlogin (remote login)
- rsh (remote shell)
- rstat
- ruptime
- rwho (remote who)
https://en.wikipedia.org/wiki/Berkeley_r-commands