-T turns on "taint" 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 that run on behalf of someone
else whom you might not necessarily trust, such as CGI programs or
any internet servers you might write in Perl. See perlsec for
details. For security reasons, this option must be seen by Perl
quite early; usually this means it must appear early on the
This question is in reference to the commands in this answer:
sed -i -- 's/foo/bar/g' *
Strictly speaking this command worked, but it is case-insensitive. I wanted to replace aubergine with eggplant and Aubergine with Eggplant, but the first command with 's/aubergine/eggplant/g' replaced Auber...
