MAN page from RedHat EL 5 perl-Filter-1.34-1.el5.rf.i386.rpm
Section: User Contributed Perl Documentation (3)
Filter::exec - exec source filter
use Filter::exec qw(command parameters) ;
This filter pipes the current source file through the program whichcorresponds to the "command"
As with all source filters its scope is limited to the current sourcefile 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
You should be very
careful when using this filter. Because of theway the filter is implemented it is possible to end up with deadlock.
Be especially careful when stacking multiple instances of the filter ina single source file.
11th December 1995.
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