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Trying to learn Linux command-line as fast as possible, know of any online test that progressively present questions requiring a command be entered. Looking for test that recall what I've answered, and not answered -- and that present command-line based questions based on frequency of command-line operation and it's methods used in the real world.

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closed as not constructive by sysadmin1138 Feb 7 '12 at 22:40

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You... don't really need one. Just install and use Linux. It's free, and there are free virtualization solutions available as well.

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@Ignacio_Vazquez-Abrams: Agreed, but still looking for one. I've been using *nix for 20 years off and on for random projects, and never mastered it's command-lines. Figure an adaptive learning system would push me to learn it. –  blunders Oct 11 '10 at 19:59
    
Grab a copy of RUTE then, and go through it command by command. –  Ignacio Vazquez-Abrams Oct 11 '10 at 20:04
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I doubt anyone could truly master all the available CLI tools available for *nix. There is far too many overlapping alternatives. –  Zoredache Oct 11 '10 at 20:18

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