The RSH Utility

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The RSH Utility

RSH provides much the same function as REXEC, but user authentication is handled differently. Unlike with REXEC, you do not need to specify a user name. The only validation performed by RSH is to verify that the user name is in a hidden file on the Unix system (the .rhosts file). If the remote host is configured to allow any user to use RSH, no user name needs to be provided.

On Unix systems, the .rhosts and the hosts.equiv files are used for authentication. Because these files can be used to grant access to either all users on a computer or some users on a computer, be careful. Refer to Internet Firewalls and Network Security, also by New Riders Publishing, for the formatting and contents of these files and related security issues.

However, because it is extremely unlikely a system would be configured in this way, the RSH utility provides the logged-on user name if no user name is provided. This can be overridden if desired. RSH has the following command-line options:

Runs commands on remote hosts running the RSH service.

C:\>rsh /?
rsh: remote terminal session not supported

Runs commands on remote hosts running the RSH service.

RSH host [-l username] [-n] command

host Specifies the remote host on which to run command.
-l username Specifies the user name to use on the remote
host. If omitted, the logged on user name is used.
-n Redirects the input of RSH to NULL.
command Specifies the command to run.

After you start RSH, it connects to the remote system’s RSH daemon (Unix-speak for a service). The RSH daemon ensures that the user name is in the .rhosts file on the remote host, and if authentication succeeds, the specified command is executed.

Like REXEC, RSH provides a certain degree of security insofar as the remote host validates the access.

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