Git pull encountered such a problem:

The following untracked working tree files would be overwritten by merge:.idea/vcs.xml

Solution:
git clean – D – FX

Note: will delete not add to the warehouse file, operation remember careful, lest change the file lost. In essence, it is to operate the untraceable local
$git clean – F – n # 1 in the warehouse

$ git clean -f -n # 1

$ git clean -f            # 2

$ git clean -fd          # 3

$ git clean -fX          # 4

$ git clean -fx          # 5

(1): The -n option will show which files will be removed when (2) is executed.

(2): This command will remove all the files shown in command (1).

(3): If you also want to remove file pieces, use the option -d.

(4): If you only want to remove files that have been ignored, use option -X.

(5): If you want to remove both ignored and unignored files, use option -x.