Save file as git-mvs in your path and then:

```sh
git mvs "s/foo/bar/g"
```

When run against a git tree like this:

    /
    ├ /foodir
    │ ├ /foofile
    │ └ /otherfile
    └ /otherdir
      ├ /foofile
      └ /otherfile

then the result is:

    /
    ├ /bardir
    │ ├ /barfile
    │ └ /otherfile
    └ /otherdir
      ├ /barfile
      └ /otherfile