Contents of p5-Filter
=====================
Filter::sh
       use Filter::sh 'command' ;

       This filter pipes the current source file through the
       program which corresponds to the command parameter using
       the Bourne shell.

Filter::exec
       use Filter::exec qw(command parameters) ;

       This filter pipes the current source file through the
       program which corresponds to the command parameter.

Filter::cpp
       use Filter::cpp ;

       This source filter pipes the current source file through
       the C pre-processor (cpp) if it is available.

WWW: http://search.cpan.org/dist/Filter/