How can I check out a particular version of one file in Git? -

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How can I see a specific version of a file git?

I found, who said: 

  $ git checkout head ~ 43 Macfile $ git reset makefile

but I do not know How to find 'head ~ 43', if I do a GIT log file , let me know how to use 'HEAD ~ 43'?

And why do I need to run git reset for that file? What does it do?

Do you know what file is related (i.e .:: specific modification)? Redo: 

  git checkout & lt; Commit & gt; & Lt; File & gt;

Other commands: 

  git checkout head ~ N & lt; File & gt;

When you want to get a version of the file back (which I do for old memories).


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