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Top Forums Shell Programming and Scripting perl Unix programming Question Post 302604178 by durden_tyler on Saturday 3rd of March 2012 12:43:44 PM
Old 03-03-2012
Quote:
Originally Posted by koricha
...can somebody tell me whats wrong with this good
PHP Code:
 #/bin/perl -f
 
substr$_, -2) = "" unless length$_ ) % 
i get an error :
Code:
 ./ev: syntax error at line 2: `(' unexpected

...
The shebang is incorrect, because the "!" character is missing after the "#".

The way it is right now, it's acting as a shell script comment. I say "shell script" because you are executing it as a shell script due to the way you've invoked it. And so the shell balks at the "(" character.

tyler_durden
 

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Perl::Critic::Policy::BuiltinFunctions::ProhibitLvalueSuUser(Contributed Perl DocPerl::Critic::Policy::BuiltinFunctions::ProhibitLvalueSubstr(3pm)

NAME
Perl::Critic::Policy::BuiltinFunctions::ProhibitLvalueSubstr - Use 4-argument "substr" instead of writing "substr($foo, 2, 6) = $bar". AFFILIATION
This Policy is part of the core Perl::Critic distribution. DESCRIPTION
Conway discourages the use of "substr()" as an lvalue, instead recommending that the 4-argument version of "substr()" be used instead. substr($something, 1, 2) = $newvalue; # not ok substr($something, 1, 2, $newvalue); # ok The four-argument form of "substr()" was introduced in Perl 5.005. This policy does not report violations on code which explicitly specifies an earlier version of Perl (e.g. "use 5.004;"). CONFIGURATION
This Policy is not configurable except for the standard options. SEE ALSO
"substr" in perlfunc (or "perldoc -f substr"). "4th argument to substr" in perl5005delta AUTHOR
Graham TerMarsch <graham@howlingfrog.com> COPYRIGHT
Copyright (c) 2005-2011 Graham TerMarsch. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.14.2 2012-06-07 Perl::Critic::Policy::BuiltinFunctions::ProhibitLvalueSubstr(3pm)
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