http://www.ibm.com/developerworks/linux/library/l-textutils/index.html
to do anything advanced, you first need to know how to use regular expressions (regex/regexp).
grep
fgrep
egrep
cut
paste
join
awk
head
tail
i would also add the following programs to the list:
gawk
sed
wget
curl
thank you IBM :)
The best place to *find* answers to programming/development questions, imo, however it's the *worst* place to *ask* questions (if your first question/comment doesn't get any up-rating/response, then u can't ask anymore questions--ridiculously unrealistic), but again, a great reference for *finding* answers.
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