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Comment by minitech | Hacker News Reader

Note that “things like this” can sometimes be done just using sed:

  % sed -i -e "s/root/toor/" -e "/joey/d" /etc/passwd

That's platform dependent. BSD sed doesn't support -i

I don't think that's true anymore, though it was historically. The sed currently shipped with both FreeBSD and OpenBSD supports -i, at least.

You can use Perl in sed mode via "perl -pe" as a more portable replacement for sed.

what should this do?