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

gitgarbagecollectall.sh

#!/bin/bash -e

function main {
	if [[ ! -d $1 ]]; then
		echo "Usage: $(basename "$0") DIR" >&2
		exit 1
	fi

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

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


main "${1%/}"