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Full Discussion: Perl System command calls to variable
Top Forums Shell Programming and Scripting Perl System command calls to variable Post 302256660 by SFNYC on Monday 10th of November 2008 10:23:23 AM
Old 11-10-2008
To capture output:

Code:
$output = `program args`;   # collect output into one multiline string
@output = `program args`;   # collect output into array, one line per element

But since you just want a date, it would be more efficient to have Perl do it than to fork off a new process.

Code:
$ cat ./date_test.pl
#!/usr/bin/perl

use strict;
use warnings;
use POSIX qw(strftime);

my $x;

$x = strftime("%y%m%d.%H%M", localtime());

print "x = $x\n";

exit 0;

$ ./date_test.pl
x = 081110.1019

 

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LEARN ABOUT DEBIAN

perl::critic::policy::variables::prohibitunusedvariables

Perl::Critic::Policy::Variables::ProhibitUnusedVariablesUser)Contributed Perl DocumenPerl::Critic::Policy::Variables::ProhibitUnusedVariables(3pm)

NAME

       Perl::Critic::Policy::Variables::ProhibitUnusedVariables - Don't ask for storage you don't need.

AFFILIATION

       This Policy is part of the core Perl::Critic distribution.

DESCRIPTION

       Unused variables clutter code and require the reader to do mental bookkeeping to figure out if the variable is actually used or not.

       At present, this Policy is very limited in order to ensure that there aren't any false positives.  Hopefully, this will become more
       sophisticated soon.

       Right now, this only looks for simply declared, uninitialized lexical variables.

	   my $x;	   # not ok, assuming no other appearances.
	   my @y = ();	   # ok, not handled yet.
	   our $z;	   # ok, global.
	   local $w;	   # ok, global.

       This module is very dumb: it does no scoping detection, i.e. if the same variable name is used in two different locations, even if they
       aren't the same variable, this Policy won't complain.

       Have to start somewhere.

CONFIGURATION

       This Policy is not configurable except for the standard options.

AUTHOR

       Elliot Shank "<perl@galumph.com>"

COPYRIGHT

       Copyright (c) 2008-2011 Elliot Shank.

       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 v5.14.2							    2012-06-07	     Perl::Critic::Policy::Variables::ProhibitUnusedVariables(3pm)
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