Command-line programs in UNIX shell scripts
"Like it or not, but sooner or later you realize that you'll have to write shell-scripts to administer UNIX. And among these scripts there certainly will be those to cooperate with interactive applications such as telnet, ftp, su, password, ssh. But it means the end of the admin's quiet life because while dealing with interactive programs one often come across numerous hidden traps which doesn't usually happen with ordinary sh-scripts. Though fortunately or may be not, but most of these problems generally turn up within first five minutes of the work under the script. The symptoms typically look like that author can't pass the authentication from the script. At first you feel confused because usual pipe constructions such as:"
(Submitted by Noel Wed Jun 29, 2005 )
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