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Top Forums Shell Programming and Scripting Perl script 'system' linking to local shell script not working Post 302362415 by pludi on Friday 16th of October 2009 02:53:14 AM
Old 10-16-2009
$? is a variable that holds the return code of the last system command, pipes, ..., pretty much the same as in the shell. By inspecting that you can check if your command succeded or not.

As for your 'hellow' script, your user might have the path to it in it's environment. But the user the webserver is running as (www) most probably doesn't. So it's always a good idea to use the absolute path, and ensure that the user 'www' has read & execute rights on the file. If you still have problems, add the 'holy trinity' to your script, and run it on the command line.
Code:
# The 'holy trinity'
use strict;
use warnings;
use diagnostics;

As for Perl spinning out of control: it might have to do with the unchecked open. I left out the success check in my examples for brevity, but you should always check the return code of it.
 

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ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME
atf-sh [-s shell] -- interpreter for shell-based test programs SYNOPSIS
atf-sh script DESCRIPTION
atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library. atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL. atf-sh executes the inter- preter, loads the atf-sh(3) library and then runs the script. You must consider atf-sh to be a POSIX shell by default and thus should not use any non-standard extensions. The following options are available: -s shell Specifies the shell to use instead of the value provided by ATF_SHELL. ENVIRONMENT
ATF_LIBEXECDIR Overrides the builtin directory where atf-sh is located. Should not be overridden other than for testing purposes. ATF_PKGDATADIR Overrides the builtin directory where libatf-sh.subr is located. Should not be overridden other than for testing purposes. ATF_SHELL Path to the system shell to be used in the generated scripts. Scripts must not rely on this variable being set to select a specific interpreter. EXAMPLES
Scripts using atf-sh(3) should start with: #! /usr/bin/env atf-sh Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh. Instead, you have to hardcode the path to atf-sh in the script and then use the -s option afterwards as a single parameter: #! /path/to/bin/atf-sh -s/bin/bash ENVIRONMENT
ATF_SHELL Path to the system shell to be used in the generated scripts. SEE ALSO
atf-sh(3) BSD
September 27, 2014 BSD
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