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