z/OS UNIX Remote Execution Protocol (z/OS UNIX REXEC) is a remote execution client that you can use to execute a command on a remote host and receive the results on the local host. z/OS UNIX RSH is also available as a remote execution client.

You must have the z/OS UNIX REXEC daemon (orexecd) running on the remote host to use z/OS UNIX REXEC to run z/OS UNIX commands. The z/OS UNIX REXEC client passes the user name, password, and command to the z/OS UNIX REXEC daemon. The daemon provides automatic logon and user authentication, depending on the parameters that you set.

You do not have to have the z/OS UNIX REXEC deamon (orexecd) running on the remote host if you are not running z/OS UNIX commands. The z/OS UNIX REXEC client can use any REXEC daemon (not just z/OS UNIX).

You must have the z/OS UNIX RSH daemon (orshd) running on the remote host to use z/OS UNIX RSH to run z/OS UNIX commands. The z/OS UNIX RSH client passes the user name, password, and command to the z/OS UNIX RSH daemon. The daemon provides automatic logon and user authentication, depending on the parameters that you set.

You do not have to have the z/OS UNIX RSH deamon (orshd) running on the remote host if you are not running z/OS UNIX commands. The z/OS UNIX RSH client can use any RSH daemon (not just z/OS UNIX).