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) . A substantial amount of documentation and examples is also included.
