Add git cheatsheet

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+Tag
+
+  git tag -a x.y.z -m "Tag version x.y.z"
+
+Squash multiple commits into one
+
+  git rebase -i HEAD~<N>
+
+  http://www.gitready.com/advanced/2009/02/10/squashing-commits-with-rebase.html
+
+Change commit message
+
+  git commit --amend
+
+Revert uncommited changes
+
+  git reset --hard HEAD
+
+Copy commit from one branch to the other
+
+  # On the source branch
+  git log -1
+  git cout <target-branch>
+  git cherry-pick <commit-id> 
+
+Setup remote repository
+
+  On remote:
+
+  1. Use the server/mkrepo.sh script:
+
+     mkdrepo.sh <name>
+     mkdrepo.sh --private <name>
+
+     <name> is without the .git suffix.
+
+  On local:
+
+  1. git remote add origin scm.codesynthesis.com:/var/scm/proj/proj.git
+  2. git push --tags origin master
+  3. # blow the local project and do clone
+     git clone scm.codesynthesis.com:/var/scm/proj/proj.git [name]
+
+Delete a branch from a remote repository
+
+  git push origin :experimental
+
+  Find a ref that matches experimental in the origin repository (e.g.
+  refs/heads/experimental), and delete it.
+
+  Using the push.sh script:
+
+  ./push.sh :<name>
+
+Rebasing
+
+  Local (e.g., from a feature branch to master):
+ 
+  git rebase <src> [<dst>]
+  
+  If <dst> is not specified, current branch is used. If <dst> is
+  specified, it is checked out.
+
+  Remote (e.g., merge someone else's changes):
+
+  git fetch
+  git rebase origin[/master]
+  git push --tags origin
+
+Submodules
+
+  git config --global status.submoduleSummary true
+  git config --global diff.submodule log
+
+  git submodule update --init  # init and update
+  git clone --recursive        # same as doing above manually
+
+  git submodule update --remote [sub] # update submodule(s) (to remote master)
+                                      # --rebase
+  
+  git fetch
+  git checkout <commit-sha1> # As above but to specific commit.
+
+  git pull             # fetches submodules, but does not update
+  git submodule update # must be done explicitly (--init --recursive)!
+
+  # Making changes, first make sure up-to-date with remote
+  #
+  git cout master # in submodule, to make changes, commit/push must be on both!
+
+  # If already made changes (in sub/):
+  git stash
+  git cout master
+  git stash pop
+
+  # Remove submodule.
+  #
+  git submodule deinit sub
+  git rm sub # then commit