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perl -tw: Perl -T: forces “taint” checks to be turned on so you can test them. Ordinarily these checks are done only when running setuid or setgid. It’s a good idea to turn them on explicitly for programs run on another’s behalf, such as CGI programs. -w: prints warnings about variable names that are mentioned only once, and scalar variables that are used before being set. Also warns about redefined subroutines, and references to undefined filehandles or filehandles opened read-only that you are attempting to write on.
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