Remote Process Execution
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rexec has the same kind of functionality that rsh has : you can execute shell commands on a remote computer.
The main difference is that rexecd authenticates by reading the username and password (unencrypted) from the socket.
Limitations
Same as rsh: sends unencrypted information over the network. Even worse, because the password is sent.
Port number
rexec uses well-known port TCP 512.
References
- rexecd - remote execution server - rexecd man page.
- rexec - remote execution client - rexec man page.