libfilter-perl - 1.64-1+b1 main

Source filters alter the program text of a module before Perl sees it, much
as a C preprocessor alters the source text of a C program before the
compiler sees it.
.
This package contains a number of source filters, including:
.
exec and sh: pipe the source file through an external command
cpp: pipe the source file through the C preprocessor
decrypt: example of simple (though weak!) source obfuscation
tee: copy filtered source to a file (debugging aid)
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A substantial amount of documentation and examples is also included.