Linux Certif

Toute la documentation sur la certification Linux LPI

Sprog::Gear::PerlCode.3pm

NAME

Sprog::Gear::PerlCode - execute your own Perl code for each line of input

DESCRIPTION

This gear allows the user to define a snippet of Perl code that will be executed for each line of input. The code snippet is wrapped with a small amount of boilerplate code (similar in purpose to Perl's "-p" option):

   $_ = $input_line;
   LINE: {
     # Perl snippet inserted here
     print $_;
   }
 
 

The built-in "print" function is also overridden to pass its arguments to the next downstream gear as a "data" message.

Thus, the default behaviour is to take the line of input in $_ and pass it directly to the next downstream gear. The code snippet can alter the contents of $_. It can also call "print" as many times as it wants to generate additional lines of output.

Note: unlike Perl's -p option, the "print" is not in a "continue" block so if you call next, the print will be skipped.

COPYRIGHT

Copyright 2004-2005 Grant McLean <grantm@cpan.org>

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