tldr/pages/common/git-submodule.md

git submodule

Inspects, updates and manages submodules.

• Install a repository's specified submodules:

git submodule update --init --recursive

• Add a git repository as a submodule:

git submodule add {{repository_url}}

• Add a git repository as a submodule at the specified directory:

git submodule add {{repository_url}} {{directory}}

• Update every submodule to its latest commit:

git submodule foreach git pull