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Top Forums UNIX for Dummies Questions & Answers Difference between using Here document and Expect in scripts Post 302523499 by kailash19 on Thursday 19th of May 2011 03:42:04 AM
Old 05-19-2011
Difference between using Here document and Expect in scripts

Hi,

I am confused between using here document and using expect for writing interactive shell scripts(like changing password ,FTP or doing su).
My questions are :
1)Why here documents cant change password from shell script.
2)Why we need to use expect for same?
3) Can Sourcing a script can do FTP or change password? like
Code:
. myscript.ksh

or
Code:
source myscript.ksh

4) What is the difference in all three behaviors(here,expect and source)?

Tried to resolve these on own but still i am confused.

Thanks
 

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Test::Expect(3pm)					User Contributed Perl Documentation					 Test::Expect(3pm)

NAME
Test::Expect - Automated driving and testing of terminal-based programs SYNOPSIS
# in a t/*.t file: use Test::Expect; use Test::More tests => 13; expect_run( command => "perl testme.pl", prompt => 'testme: ', quit => 'quit', ); expect("ping", "pong", "expect"); expect_send("ping", "expect_send"); expect_is("* Hi there, to testme", "expect_is"); expect_like(qr/Hi there, to testme/, "expect_like"); DESCRIPTION
Test::Expect is a module for automated driving and testing of terminal-based programs. It is handy for testing interactive programs which have a prompt, and is based on the same concepts as the Tcl Expect tool. As in Expect::Simple, the Expect object is made available for tweaking. Test::Expect is intended for use in a test script. SUBROUTINES
expect_run The expect_run subroutine sets up Test::Expect. You must pass in the interactive program to run, what the prompt of the program is, and which command quits the program: expect_run( command => "perl testme.pl", prompt => 'testme: ', quit => 'quit', ); expect The expect subroutine is the catch all subroutine. You pass in the command, the expected output of the subroutine and an optional comment. expect("ping", "pong", "expect"); expect_send The expect_send subroutine sends a command to the program. You pass in the command and an optional comment. expect_send("ping", "expect_send"); expect_is The expect_is subroutine tests the output of the program like Test::More's is. It has an optional comment: expect_is("* Hi there, to testme", "expect_is"); expect_like The expect_like subroutine tests the output of the program like Test::More's like. It has an optional comment: expect_like(qr/Hi there, to testme/, "expect_like"); expect_handle This returns the Expect object. expect_quit Closes the Expect handle. SEE ALSO
Expect, Expect::Simple. AUTHOR
Leon Brocard, "<acme@astray.com>" COPYRIGHT
Copyright (C) 2005, Leon Brocard This module is free software; you can redistribute it or modify it under the same terms as Perl itself. perl v5.12.3 2011-06-12 Test::Expect(3pm)
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