Who could tell me how to learn unix fastly?

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yours : ^~^hyphay

Most unix systems come with man pages (manual pages). For example, to find out how to use crontab type: man crontab. There's even a man page for man!

Check the FAQ's on this forum. You'll find lots of books and URLs
for online stuff all about learning UNIX (and lots of other stuff
too).

I think the best way to learn UNIX is to buy the book, "Unix in a
NutShell" by O'Reily. Start at page one and try every command listed A-Z. Even though you will probably never use half of them, it will still give you a good lesson on how it works. The man pages were written for the UNIX savy and not for beginners. It will just frustrate you. Oh yea stay away from any of the books that end with "for Dummies.

Blasphemy! If you don't learn to at least try to read the man pages, you'll soon find that people will refer you to the old RTFM acronym...

Linux in a Nutshell is more of a reference, and although a little nicer that the man pages, won't help that much more. Nearly any book by O'Reilly, though, is good.