Rscript is based upon Expect/Tcl and allows you to automate
remote logins and execute remote commands, somewhat like
rsh.
It's also useful for scheduling tasks using your local cron
instead of the remote cron (great for automating commands
on systems where you don't have cron privileges!). Command
lists can be executed as user or as root, depending upon
your needs. Finally, you have the option of having a
confirmation email sent to you from the remote host upon
script completion.