Remote Shell

The remote shell (rsh) is a command line computer program that can execute shell commands as another user, and on another computer across a computer network.

remote shell (rsh)
Initial release1983 (1983)
Written inC
Operating systemCross-platform

The remote system to which rsh connects runs the rsh daemon (rshd). The daemon typically uses the well-known Transmission Control Protocol (TCP) port number 514.

History

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.

The rsh command has the same name as another common UNIX utility, the restricted shell, which first appeared in PWB/UNIX; in System V Release 4, the restricted shell is often located at /usr/bin/rsh.

Limitations

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 passwords over the network. rsh has largely been replaced with the secure shell (ssh) program, even on local networks.

Example

As an example of rsh use, the following executes the command mkdir testdir as user remoteuser on the computer host.example.com running a UNIX-like system:

$ 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.

gollark: That doesn't exist any more.
gollark: > because securityIn what way?
gollark: That couldn't really have been done before `set shell.allow_disk_startup false` existed, but now it actually *is* fairly safe to do that!
gollark: > [pr] allow custom os selection through bios, only ship craftos by defaultThat could actually work if it boots a different `bios.lua` if that's on the disk.
gollark: I did contribute some docs to the wiki a while ago, but they might have been lost in the accident.

See also

References
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