$ git checkout -b debug
Switched to a new branch 'debug'
$ git checkout master
Switched to branch 'master'
$ git merge debug
將 debug 分支合併回 master
$ git branch -d debug
Deleted branch debug.
$ git commit -m "commit message"
改變指標
$ git reset
會移動分支
$ git log
秀出分支的頭到尾
