can place it under git revision control as follows.
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-$ tar -xzf project.tar.gz
+$ tar xzf project.tar.gz
$ cd project
$ git init-db
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shows the difference between that previous state and the state two
-commits ago. Also, HEAD~5 can be used as a shorthand for HEAD^^^^^,
+commits ago. Also, HEAD~5 can be used as a shorthand for HEAD{caret}{caret}{caret}{caret}{caret},
and more generally HEAD~n can refer to the nth previous commit.
Commits representing merges have more than one parent, and you can
specify which parent to follow in that case; see