Update all git repositories in one folder

update_git.sh

#!/bin/sh

# check if console program is installed
check_installation(){
	type $1 >/dev/null 2>&1 || { echo >&2 "$1 is required: $2 Aborting."; exit 1; }
}

# printing usage information
usage(){
	echo "This program is used to update all git repositories in the given folder."
	echo "Usage: $0 <folder>"
	exit 1
}

# update a git repository
update(){
	# printing action
	echo "\nUpdating $1 ..."

	# change directory to repository
	cd "$1"

	# get current branch
	current_branch=$(git rev-parse --abbrev-ref HEAD)

	# update branch repository
	[[ $current_branch =~ ^(master|main)$ ]] && git pull --ff-only --all -p || git pull --ff-only origin $current_branch
	
	# cleanup local branches
	git branch --merged | egrep -v "(^\*|master|main)" | xargs git branch -D
}

# check necessary installations
check_installation "git" "Please download git from https://git-scm.com/downloads."
check_installation "realpath" "Please install realpath with 'sudo apt install realpath' or 'brew install coreutils'."

# check if arguments passed
[ $# -eq 0 ] && usage

# printing action
echo "Update all git repositories..."

# absolute origin folder
folder=$(realpath $1)

# update repositories with .git folder
for git_folder in $(find $folder -name '.git'); do update $(dirname "$git_folder"); done

thank you! it's really been useful 👌🏼