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Full Discussion: Loop breaks through ssh in script
Operating Systems AIX Loop breaks through ssh in script Post 302874933 by MadeInGermany on Monday 18th of November 2013 03:48:30 AM
Old 11-18-2013
Quote:
Originally Posted by omonoiatis9
thank you i will try the -n option to see if it works.
i use the backticks because this way i tell the script if the command inside the backticks executes successfully then proceed. else if the command fails it doesnt get into the if statement.
That's nonsense. The exit status of the command between if and then is always tested - you don't need backticks for that.
 

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LEARN ABOUT CENTOS

perl::critic::policy::inputoutput::prohibitbacktickoperators

Perl::Critic::Policy::InputOutput::ProhibitBacktickOperaUser(Contributed Perl DocumPerl::Critic::Policy::InputOutput::ProhibitBacktickOperators(3)

NAME

       Perl::Critic::Policy::InputOutput::ProhibitBacktickOperators - Discourage stuff like "@files = `ls $directory`".

AFFILIATION

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

DESCRIPTION

       Backticks are super-convenient, especially for CGI programs, but I find that they make a lot of noise by filling up STDERR with messages
       when they fail.	I think its better to use IPC::Open3 to trap all the output and let the application decide what to do with it.

	   use IPC::Open3 'open3';
	   $SIG{CHLD} = 'IGNORE';

	   @output = `some_command`;			  #not ok

	   my ($writer, $reader, $err);
	   open3($writer, $reader, $err, 'some_command'); #ok;
	   @output = <$reader>;  #Output here
	   @errors = <$err>;	 #Errors here, instead of the console

CONFIGURATION

       Alternatively, if you do want to use backticks, you can restrict checks to void contexts by adding the following to your .perlcriticrc
       file:

	   [InputOutput::ProhibitBacktickOperators]
	   only_in_void_context = 1

       The purpose of backticks is to capture the output of an external command.  Use of them in a void context is likely a bug.  If the output
       isn't actually required, "system()" should be used.  Otherwise assign the result to a variable.

	   `some_command`;			#not ok
	   $output = `some_command`;		#ok
	   @output = `some_command`;		#ok

NOTES

       This policy also prohibits the generalized form of backticks seen as "qx{}".

       See perlipc for more discussion on using "wait()" instead of "$SIG{CHLD} = 'IGNORE'".

       You might consider using the "capture()" function from the IPC::System::Simple module for a safer way of doing what backticks do,
       especially on Windows.  The module also has a safe wrapper around "system()".

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::InputOutput::ProhibitBacktickOperators(3)
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