1.查看可以被删除的untracked files
git clean -f -n
2.删除untracked files
git clean -f
If you want to also remove directories, run git clean -f -d or git clean -fd
If you just want to remove ignored files, rungit clean -f -X or git clean -fX
If you want to remove ignored as well as non-ignored files, run git clean -f -x or git clean -fx
Note the case difference on the X for the two latter commands.
原内容出自stackoverflow，备份以便以后查询。