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Full Discussion: Cannot execute Unix command in a simple perl script
Top Forums Shell Programming and Scripting Cannot execute Unix command in a simple perl script Post 302558456 by Corona688 on Friday 23rd of September 2011 03:12:47 PM
Old 09-23-2011
[edit] think we crossposted. I still need the -v one though!

---------- Post updated at 01:12 PM ---------- Previous update was at 01:09 PM ----------

Quote:
I have already tested this with shell script and works fine. but i just want to know why the same unix command gives the same result as executed in a shell script
Because, as already explained, this isn't a shell script, this is shell script inside perl, and things are being substituted inside perl before the shell even gets to it.

You can see the same problem in shell code:

Code:
$ NF=slartibartfast
$ echo '{ $NF }'
{ $NF }
$ echo "'{ $NF }'"
{ slartibartfast }
$

If you wanted the literal string $NF, double quotes won't cut it, even if you single quote things inside double quotes.

I'll work on a solution for you. (still need the -v output)
Last edited by Corona688; 09-23-2011 at 04:17 PM..
 

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LEARN ABOUT CENTOS

test::script

Test::Script(3) 					User Contributed Perl Documentation					   Test::Script(3)

NAME

       Test::Script - Basic cross-platform tests for scripts

DESCRIPTION

       The intent of this module is to provide a series of basic tests for 80% of the testing you will need to do for scripts in the script (or
       bin as is also commonly used) paths of your Perl distribution.

       Further, it aims to provide this functionality with perfect platform-compatibility, and in a way that is as unobtrusive as possible.

       That is, if the program works on a platform, then Test::Script should always work on that platform as well. Anything less than 100% is
       considered unacceptable.

       In doing so, it is hoped that Test::Script can become a module that you can safely make a dependency of all your modules, without risking
       that your module won't on some platform because of the dependency.

       Where a clash exists between wanting more functionality and maintaining platform safety, this module will err on the side of platform
       safety.

FUNCTIONS

   script_compiles
	   script_compiles( 'script/foo.pl', 'Main script compiles' );

       The "script_compiles" test calls the script with "perl -c script.pl", and checks that it returns without error.

       The path it should be passed is a relative unix-format script name. This will be localised when running "perl -c" and if the test fails the
       local name used will be shown in the diagnostic output.

       Note also that the test will be run with the same perl interpreter that is running the test script (and not with the default system perl).
       This will also be shown in the diagnostic output on failure.

   script_runs
	   script_runs( 'script/foo.pl', 'Main script runs' );

       The "script_runs" test executes the script with "perl script.pl" and checks that it returns success.

       The path it should be passed is a relative unix-format script name. This will be localised when running "perl -c" and if the test fails the
       local name used will be shown in the diagnostic output.

       The test will be run with the same perl interpreter that is running the test script (and not with the default system perl). This will also
       be shown in the diagnostic output on failure.

SUPPORT

       All bugs should be filed via the bug tracker at

       <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Test-Script>

       For other issues, or commercial enhancement and support, contact the author.

AUTHOR

       Adam Kennedy <adamk@cpan.org>

SEE ALSO

       prove, <http://ali.as/>

COPYRIGHT

       Copyright 2006 - 2009 Adam Kennedy.

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

       The full text of the license can be found in the LICENSE file included with this module.

perl v5.16.3							    2009-11-24							   Test::Script(3)
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