commandlinefu.com is the place to record those command-line gems that you return to again and again.
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This is priceless for discovering otherwise invisible characters in files. Like, for example, that stray Control-M at the end of the initial hash bang line in your script, which causes it to generate a mysterious error even though it looks fine.
('od' is the last word, of course, but for many purposes it's much harder to read.)
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