Git command I used most!

$ git reset --hard a_commit # 强行回滚到某个旧版本，这在很多时候都很好用，比如分支错乱git rebase又不会用的时候
$ git fetch # 如果git remote有更新，必须要fetch一下，否则可能找不到最新的commits
$ git cherry-pick a_commit # 把某个commit放到当前本地branch

$ git config --global user.email 'mail_zlj a-t 163.com' ＃Set email
$ git config --global user.email #Show email
$ git config --global user.name
$ git config user.email # If we don't use the `--global`, that means we set in this git project we use another user.email. `git commit` and `git log` to see what difference. Then if it is displayed in GitHub, we can see another user is contributing if this email is an account of GitHub. 

$ git remote add origin https://github.com/gazeldx/duokong.git #Add a remote URL
$ git remote -v #List all remotes
$ git remote set-url origin https://github.com/gazeldx/hutch.git
$ git remote add upstream https://github.com/gocardless/hutch.git
$ git ls-remote # list remote branches

$ git push -u coding coding_local:master # Push to (coding master) remote branch from coding_local branch

$ git branch # View local branches
$ git branch -r # View remote branches
$ git branch -d the_local_branch # Delete a local branch
$ git push origin --delete develop # Delete a remote branch develop.
如何在remote上创建一个branch？下面两句即是，参考自：http://stackoverflow.com/questions/1519006/how-do-you-create-a-remote-git-branch
$ git checkout -b your_branch # 切换到your_branch，如果your_branch不存在就创建它。这句话不会修改任何代码。
$ git push <remote-name> <branch-name> # E.g: git push origin your_branch

如何合入到master？下面几句即是，参考自：http://stackoverflow.com/questions/5601931/best-and-safest-way-to-merge-a-git-branch-into-master
$ git checkout master
$ git pull origin master
$ git merge test
$ git push origin master
$ git log <path/branch>

$ 可以把一些改动先藏起来。这样就可以成功pull代码了，否则可能报错有冲突，不让你pull。pull完代码后，再git stash apply stash@{id}，就可以把本地藏起来的改动合入本地，可能需要你解决一下冲突。
$ git stash list
$ git stash show -p stash@{0} # 查看stash@{0}内容.stash@{0}可用0替换。下同。
$ git stash apply stash@{0} # 将stash@{0}内容恢复到当前版本

https://help.github.com/articles/checking-out-pull-requests-locally/
https://help.github.com/articles/merging-a-pull-request/
$ git pull git://github.com/chenge/ruby-db-admin.git master # Merge from Pull request

$ git log --oneline
$ git rebase -i <commit_id_or_branch_name> # commit_id_or_branch_name一般会选择用master。进入后，在界面中可以reorder(直接修改行的位置), squash(把若干commit合成一个)或（直接删除掉不需要的commit就可以删除commit了）
$ 假如现在有两个分支同时开发，都基于master。现在branch_A先合入到master中了，这时在branch_B中应该git rebase -i master，然后`:q!`。如果有冲突，就修复冲突，然后把修复后的文件`git add`进来，然后
$ git rebase --continue # 可能还有冲突，继续解决冲突，并git rebase --continue。最终会使得branch_B中的所有提交都在branch_A之后。所有人都这样做就完美了。
$ git push origin your_branch -f # 要加-f才能提交成功