Gather my frequently used git commands [uts-0092]

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#### utensil opened issue at 2016-05-11 12:48:

http://rogerdudler.github.io/git-guide/ is not exactly complete, and some commands are seldom used.
- https://www.perforce.com/blog/141218/git-beyond-basics-using-shallow-clones
- http://stackoverflow.com/questions/20280726/how-to-git-clone-a-specific-tag
- https://github.com/git-tips/tips