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Top Forums Shell Programming and Scripting How to use shell variable in awk? Post 302621635 by thibodc on Tuesday 10th of April 2012 07:46:17 PM
Old 04-10-2012
How to use shell variable in awk?

How do you use a shell variable in awk? I am using Solaris 10 and don't have GNU products installed.

File (transportation.txt) contents:
Code:
car
boat 
airplane
snowmobile
bicycle
sled

This awk statment works (prints from the car line down to bicycle
Code:
awk '/car/,/bicycle/' transportation.txt

But what if instead of car I use a shell variable named vehicle (where the variable can be any value) passed by the user?

This line doesn't work (what's missing?)
Code:
awk '/$vehicle/,/bicycle/' transportation.txt


Last edited by Franklin52; 04-11-2012 at 03:39 AM.. Reason: Please use code tags for code and data samples, thank you
 

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Perl::Critic::Policy::Variables::RequireLexicalLoopIteraUser(Contributed Perl DocumPerl::Critic::Policy::Variables::RequireLexicalLoopIterators(3)

NAME
Perl::Critic::Policy::Variables::RequireLexicalLoopIterators - Write "for my $element (@list) {...}" instead of "for $element (@list) {...}". AFFILIATION
This Policy is part of the core Perl::Critic distribution. DESCRIPTION
This policy asks you to use "my"-style lexical loop iterator variables: foreach my $zed (...) { ... } Unless you use "my", "for"/"foreach" loops use a global variable with its value "local" to the block. In other words, foreach $zed (...) { ... } is more-or-less equivalent to { local $zed foreach $zed (...) { ... } } This may not seem like a big deal until you see code like my $bicycle; for $bicycle (@things_attached_to_the_bike_rack) { if ( $bicycle->is_red() and $bicycle->has_baseball_card_in_spokes() and $bicycle->has_bent_kickstand() ) { $bicycle->remove_lock(); last; } } if ( $bicycle and $bicycle->is_unlocked() ) { ride_home($bicycle); } which is not going to allow you to arrive in time for dinner with your family because the $bicycle outside the loop is not changed by the loop. You may have unlocked your bicycle, but you can't remember which one it was. Lexical loop variables were introduced in Perl 5.004. This policy does not report violations on code which explicitly specifies an earlier version of Perl (e.g. "require 5.002;"). CONFIGURATION
This Policy is not configurable except for the standard options. SEE ALSO
"Foreach Loops" in perlsyn "my() in Control Structures" in perl5004delta AUTHOR
Jeffrey Ryan Thalhammer <jeff@imaginative-software.com> COPYRIGHT
Copyright (c) 2005-2011 Imaginative Software Systems. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. The full text of this license can be found in the LICENSE file included with this module. perl v5.16.3 2014-06-09 Perl::Critic::Policy::Variables::RequireLexicalLoopIterators(3)
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