bash one-liner to pull all git repositories in the current directory

git-update.sh

# most of this is sourced from stackoverflow answers
# git diff checks if the current directory is clean
# git remote checks if there is even a remote repo to pull from
ls | xargs -I{} sh -c '[[ -d {}/.git ]] && [[ $(git -C {} diff --shortstat 2> /dev/null | tail -n1) == "" ]] && [[ $(git -C {} remote) != "" ]] && echo {}: && git -C {} pull'

inspired by this:
https://stackoverflow.com/questions/3497123/run-git-pull-over-all-subdirectories
checking directory cleanliness is from here:
https://stackoverflow.com/questions/2657935/checking-for-a-dirty-index-or-untracked-files-with-git