Exploring Expect: A Tcl-Based Toolkit for Automating Interactive ProgramsPaperback, 27 December 1994

Written by the author of Expect, this is the first book to explain how this new part of the UNIX toolbox can be used to automate Telnet, FTP, passwd, rlogin, and hundreds of other interactive applications. Based on Tcl (Tool Command Language), Expect lets you automate interactive applications that have previously been extremely difficult to handle with any scripting language.