Recursively garbage collect (compress) all child Git repositories from a given base directory.

gitgarbagecollectall.sh

#!/bin/bash -e

if [[ ! -d $1 ]]; then
	echo "Usage: $(basename "$0") DIR"
	exit 1
fi

IFS=$'\n'
for gitRepoDir in $(find "$(readlink -f "$1")" -type d -name ".git"); do
	gitRepoDir=${gitRepoDir%/.git}

	echo
	echo

	echo "$gitRepoDir"
	git --git-dir "$gitRepoDir/.git" gc --aggressive --prune=now
	echo
done

unset IFS