The Berkeley r-commands are a suite of programs that enable users of Linux or Unix-like systems to access files and execute commands on remote systems over a TCP/IP computer network.
The r-commands are as follows:
| Client | Daemon | Port | Protocol |
|---|---|---|---|
| rcp | rshd | 514 | TCP |
| rexec | rexecd | 512 | TCP |
| rlogin | rlogind | 513 | TCP |
| rsh | rshd | 514 | TCP |
| rstat | rstatd | ? | UDP |
| ruptime | rwhod | 513 | UDP |
| rwho | rwhod | 513 | UDP |
https://en.wikipedia.org/wiki/Berkeley_r-commands