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Full Discussion: Using cd on Variables
Top Forums Shell Programming and Scripting Using cd on Variables Post 302391022 by solar zenith on Friday 29th of January 2010 07:44:23 PM
Old 01-29-2010
Using cd on Variables

I can't for the love of me figure out how to work with double quotes and single quotes in variables in bash scripts. For instance, I added the following line to my .bash_aliases file:
Code:
WINDOWS="'/host/Documents and Settings/Solar Zenith/My Documents'";

I want this so that I can go straight to 'My Documents' in my Windows installation (which is mounted at /host) by using cd in the terminal. This is my issue though:
Code:
solarzenith:~$ echo $WINDOWS
'/host/Documents and Settings/Solar Zenith/My Documents'
solarzenith:~$ cd $WINDOWS
bash: cd: '/host/Documents: No such file or directory
solarzenith:~$

What do I have to change the code in .bash_aliases to to make this work? Also, if you know of any good sites that explain this sort of thing, that would be great.
 

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General::Interpolated(3pm)				User Contributed Perl Documentation				General::Interpolated(3pm)

NAME
Config::General::Interpolated - Parse variables within Config files SYNOPSIS
use Config::General; $conf = new Config::General( -ConfigFile => 'configfile', -InterPolateVars => 1 ); DESCRIPTION
This is an internal module which makes it possible to interpolate Perl style variables in your config file (i.e. $variable or "${variable}"). Normally you don't call it directly. VARIABLES
Variables can be defined everywhere in the config and can be used afterwards as the value of an option. Variables cannot be used as keys or as part of keys. If you define a variable inside a block or a named block then it is only visible within this block or within blocks which are defined inside this block. Well - let's take a look to an example: # sample config which uses variables basedir = /opt/ora user = t_space sys = unix <table intern> instance = INTERN owner = $user # "t_space" logdir = $basedir/log # "/opt/ora/log" sys = macos <procs> misc1 = ${sys}_${instance} # macos_INTERN misc2 = $user # "t_space" </procs> </table> This will result in the following structure: { 'basedir' => '/opt/ora', 'user' => 't_space' 'sys' => 'unix', 'table' => { 'intern' => { 'sys' => 'macos', 'logdir' => '/opt/ora/log', 'instance' => 'INTERN', 'owner' => 't_space', 'procs' => { 'misc1' => 'macos_INTERN', 'misc2' => 't_space' } } } As you can see, the variable sys has been defined twice. Inside the <procs> block a variable ${sys} has been used, which then were interpolated into the value of sys defined inside the <table> block, not the sys variable one level above. If sys were not defined inside the <table> block then the "global" variable sys would have been used instead with the value of "unix". Variables inside double quotes will be interpolated, but variables inside single quotes will not interpolated. This is the same behavior as you know of Perl itself. In addition you can surround variable names with curly braces to avoid misinterpretation by the parser. SEE ALSO
Config::General AUTHORS
Thomas Linden <tlinden |AT| cpan.org> Autrijus Tang <autrijus@autrijus.org> Wei-Hon Chen <plasmaball@pchome.com.tw> COPYRIGHT
Copyright 2001 by Wei-Hon Chen <plasmaball@pchome.com.tw>. Copyright 2002-2010 by Thomas Linden <tlinden |AT| cpan.org>. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See <http://www.perl.com/perl/misc/Artistic.html> VERSION
2.14 perl v5.10.1 2010-12-01 General::Interpolated(3pm)
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