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Top Forums Shell Programming and Scripting How to exit from shell script if above condition fails? Post 302862451 by Scott on Thursday 10th of October 2013 07:40:29 PM
Old 10-10-2013
If $back_home is not defined then the command cd ${back_home} would evaluate to just cd (since "back_home" would evaluate to nothing). This would indeed take you "back home" (as in to your home directory - since cd with no arguments is equivalent to cd $HOME).

If you want to test if a variable is defined, you should use the test command!

Code:
test $back_home || exit

 

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PERLCONSOLE(1p) 					User Contributed Perl Documentation					   PERLCONSOLE(1p)

NAME
perlconsole - light program that lets you evaluate Perl code interactively. COPYRIGHT
Perl Console is Copyright (C) 2007 by Alexis Sukrieh DESCRIPTION
Perl Console is a small program that implements a Read-eval-print loop: it lets you evaluate Perl code interactively. It uses Readline to grab input, and provides completion with all the namespaces loaded during your session. It allows you to load a module in your session and test a function exported by it. COMMANDS
It's possible to interact with the console with internal commands. The following commands are supported in this version: :help display the interactive help screen :quit quit the console :set set a preference (see PREFERENCES). RCFILE
PerlConsole will look for a rcfile located in your home directory called: ~/.perlconsolerc Every line in that file will be evaluated as if they were issued in the console. You can then load there your favorite modules, or even define your preferences. Example of a valid ~/.perlconsolerc :set output = dumper use Date::Calc; PREFERENCES
Preferences can be set with the :set command. The following preferences are supported in this version: output changes the output of evaluated code For details about commands, ype :help <command> within the console. AUTHOR
Perl Console was writen by Alexis Sukrieh <sukria@sukria.net>. perl v5.12.4 2011-09-18 PERLCONSOLE(1p)
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