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			Today, I needed to script removing the last couple lines of a file from the shell. Theheadcommand shipped by macOS doesn't support-n -2But theirtailcommand totally supports-n +3tac myfile.txt | tail -n +3 |tac
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			Ugh. I don't actually have 'tac' by default on macOS.
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			Sigh. time for the trivial perl script.
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			On second thought. cat file.txt | sed '$d'| sed '$d' is inelegant but unambiguous.
