Mirror and update git/GitHub repository mirrors via a bash script

update_git_mirrors.sh

#!/usr/bin/env bash

# Updates all git repository mirrors that sit in current
# directory with a folder name ending on .git.
#
# Also allows to add repositories. See usage.
#
# To remove a mirrored repository simply delete the folder.

function print_usage() {
    echo "Usage: update_github_mirrors.sh [add REPO_URL]"
    exit 1
}

if [[ $# -eq 0 ]]; then
    for cur_dir in $(ls -d *.git); do
        echo "-> Updating ${cur_dir}"

        pushd ${cur_dir} > /dev/null
        git remote prune origin
        git remote update -p
        popd > /dev/null

        echo ""
    done

    echo "Updated all repositories"
elif [[ $# -eq 2 ]]; then
    if [[ "$1" == "add" ]]; then
        git clone --mirror "$2"
    else
        print_usage
    fi
else
    print_usage
fi

exit 0