It's sad how almost nobody teaches old UNIX goodies these days. I don't remember how I learned about man page sections but certainly nobody taught me. Some people on Reddit discovered script(1) after I used it to crash grsec. What's your favorite less well known UNIX tool/trivia?
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Definitely tac, my former coworkers tried from time to time to "correct" my scripts assuming it's cat misspelled :)
I know this one from 4K demos. A trick for packing data into a shellscript is to "tac" it to the end, then have the script tac itself. Works great if whatever binary file format you used ignores trailing junk (and tac is binary-clean even though it's meant for text).
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Then there's its sibling, rev, which is also handy sometimes.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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