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Can someone transform it into community wiki please? I guess I've got no privileges for that.

Let's list practical sources for learning about performing certain tasks on *nix command line.

E.g. I want to delay execution of a script and I don't know about sleep(1). I can do apropos delay, spot there sleep(1) and finally man 1 sleep. What else comes to your mind?

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Wouldn't asking a question for each of those examples be more appropriate? I would list unix.stackexchange as a practical source to answer those questions. shrug – hometoast Feb 7 '11 at 19:44
Absolutely not. Learning yourself is much more practical then asking others every time, IMO. – alex Feb 7 '11 at 19:49

commandlinefu one such resource.

The GNU manual is also very useful.

However, my final answer has to be Google, adding 'site:' qualifiers for one of the above sites, or unix.se as appropriate.

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