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How can I pass a password to the "su" command?

I have a program that is going to take a password as input and then do a shell execute to perform a "su" (switch user) command in UNIX. However, I don't know how to pass the password variable to the UNIX su command. The language I have to use for this is pretty limited (UniBasic).

Any ideas?

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sudo can be configured such that no password is asked.
– PolyThinker
Commented Jan 16, 2009 at 15:39

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How can I pass a password to the "su" command?

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