On Mavericks I want to start the terminal when using my Live-USB.

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    Menubar > Utilities > Terminal or Menubar > Dienstprogramme > Terminal – klanomath Feb 1 '17 at 14:55
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    You might want to separate this question into two parts: 1) How to start a terminal from a recovery USB flash drive and post another question 2) How to repair "unknown file system" Leave part 1 here, and make a new question to address part 2. You're likely to get more actionable information that way. Good luck! – Mr. Kennedy Feb 1 '17 at 15:51

A bash shell is available in Maverick's Recovery Mode from the menubar under Utilities:

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If you suspect that the internal recovery disk is compromised and cannot boot into it with Command+r, you could try booting into the "internet recovery mode" with Command+Option+r. It might take a minute or two to load the Terminal option.

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