How do I move an existing Git submodule within a Git repository?

Question

I would like to change the directory name of a Git submodule in my Git superproject.

Lets suppose I have the following entry in my .gitmodules file:

Answer 1

The most modern answer, taken from Valloric's comment above:

1. Upgrade to Git 1.9.3 (or 2.18 if the submodule contains nested submodules)
2. git mv old/submod new/submod
3. Afterwards the .gitmodules and the submodule directory are already staged for a commit (you can verify this with git status.)
4. Commit the changes with git commitand you're good to go!

Done!