Shell one-liners
Classic UNIX tips: “Learn 10 good UNIX usage habits
(Break bad UNIX usage patterns)” [slashdot] [digg] [reddit]
Beginner? Look at the short list of UNIX commands.
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Command-line fu is a huge group database of CLI wisdom.
Winning one-liners (Usenet thread, 1991)
Great ImageMagick one-liners for making text boxes, text images, symbol font graphics, caption and word labels and icons.
“Five Quick Command Line Tips”
“Great Command-line Combinations”
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Usenet: comp.unix.shell [topics”>topics] [FAQ]
torfree.net+(Al+Aab)”>Al Aab’s text hacks
The basics: an intro and torial/unix/index.asp”>
long list of tips and articles
community database of tech “recipes”: tutorials on every subject
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How to do everything: torials.com/”>unix tutorials
Interesting tools/”>UNIX tools
The classic Useless use of cat award
tool+trick+OR+tip”>searchpattern
Linux mailing lists
Plenty of these have good tips.