expect
A Tool for Automating Interactive Programs
Expect is a tool primarily for automating interactive applications, such as telnet, ftp, passwd, fsck, rlogin, tip, and more. Expect really makes this stuff trivial. Expect is also useful for testing these applications. It is described in many books, articles, papers, and FAQs. There is an entire book on it available from O'Reilly.
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The following distributions are not officially supported. Use these packages at your own risk.