Filter::exec - exec source filter

       Paul Marquess

       11th December 1995.

perl v5.40.0                                       2024-11-17                                  Filter::exec(3pm)

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

       As with all source filters its scope is limited to the current source file only. Every file you want to
       be processed by the filter must have a

           use Filter::exec qw(command ) ;

       near the top.

       Here is an example script which uses the filter:

           use Filter::exec qw(tr XYZ PQR) ;
           $a = 1 ;
           print "XYZ a = $a\n" ;

       And here is what it will output:

           PQR = 1

       Filter::exec - exec source filter

           use Filter::exec qw(command parameters) ;

       You should be very careful when using this filter. Because of the way the filter is implemented it is
       possible to end up with deadlock.

       Be especially careful when stacking multiple instances of the filter in a single source file.