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sed and awk vs Perl
I can't bring myself to learn Perl. I know it's powerful and well suited to text manipulation and parsing, but the language is too irregular for me. I know REs well, so I can do useful things with sed (mostly just the s(ubstitute) command), but I do a great deal with awk (usually gawk). It is really powerful for parsing and the C-based language is straightforward. Try them, you might like them!