The config file is .gitmodules
git submodule add git://github.com/me/module.git directory
git status
git clone git://github.com/schacon/myproject.git
git submodule init
git submodule update
git submodule deinit -f -- directoryOrName
rm -rf .git/modules/directoryOrName
git rm –cached directory
Remove related rows from .gitmodules
vim .gitmodules