Expect is a program that performs programmed dialogue with other
interactive programs.  It is briefly described by its man page, expect(1).

This version is based on Japanized Tcl/Tk, so it has 'kanji' command.

It uses pseudo-tty's to control the child processes, so it is not affected
by programs that refuse to read from stdin or pipes. (eg: passwd(1) etc).

WWW: http://expect.nist.gov/
FAQ: http://expect.nist.gov/FAQ.html