概述：
将长长的名字变成个性化名称，将一个命令字符串赋值给一个变量。
1.为提交取一个别名
语法： git config --global alias.ci commit
$ vim README Administrator@USER-20170424ZG MINGW64 ~/grit (master) $ git status On branch master Your branch is ahead of 'origin/master' by 13 commits. (use "git push" to publish your local commits) Changes not staged for commit: (use "git add <file>..." to update what will be committed) (use "git checkout -- <file>..." to discard changes in working directory) modified: README Untracked files: (use "git add <file>..." to include in what will be committed) ticgit/ no changes added to commit (use "git add" and/or "git commit -a") Administrator@USER-20170424ZG MINGW64 ~/grit (master) $ git ci -a -m "README" [master ac67cd6] README 1 file changed, 1 insertion(+), 1 deletion(-) 总结：git ci -a -m "README"总结：本质理解别名就是字符串替代，但不能是git关键字
