I'd recommend setting up ssh on the machines if it isn't already. It has a couple methods for letting you skip the password prompt. Then, you can just run something like 
system("ssh machine command");

[download]
Plus, you get the added bonus of not having to have your password sent unencrypted over the line, as it is with telnet. The same can be done with rsh, but it's not recommended, as rsh is known to not be very secure.

In reply to Re: Moving around with password protected machines. by plaid
in thread Moving around with password protected machines. by Pearte

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