git-submodule

# ref: https://git-scm.com/book/en/v2/Git-Tools-Submodules
# export GITCLONEOPTIONS="--depth 1"
# git clone url
# git clone --recursive url

# git config --global diff.submodule log
# Pulling in Upstream Changes
# git fetch
# git merge origin/master

# git checkout -b v10062016 remotes/origin/bringup
# git branch -vv

# git submodule init
# git submodule update
# git submodule update --remote [submodule_name]
# git submodule foreach 'git rup'
# git submodule foreach 'git branch'
# git submodule foreach 'git checkout -b v10062016 remotes/origin/bringup'
# git submodule update --remote
# git config --global status.submodulesummary 1
# git log -p --submodule
# git submodule update --remote
# git submodule update --remote --merge
# git submodule update --remote --rebase
# git diff --cached DbConnector
# git diff --cached --submodule
# git commit -am 'added DbConnector module'
# git push --recurse-submodules=check
# git push --recurse-submodules=on-demand
# git submodule foreach 'git stash'
# git submodule foreach 'git checkout -b bringup remotes/origin/bringup'
# git diff; git submodule foreach 'git diff'

Alias
$ git config --global alias.sdiff '!'"git diff && git submodule foreach 'git diff'"
$ git config --global alias.spush 'push --recurse-submodules=on-demand'
$ git config --global alias.supdate 'submodule update --remote --merge'