Bash script that keeps all Git repositories within a specified directory up to date.

git-fork-update.bash

#!/usr/bin/bash

#
# This script keeps all Git repositories within a specified directory up to date.
#
# Consider the following example. The linux and curl repositories will be updated 
# when you run this in the gitforks directory.
#  
#  gitforks/
#    linux/.git/      linux Git repository
#    curl/.git/       curl Git repository
#    update.sh        This script
#    last_update.txt  Contains last updated time.
#
# When the script is run, it puts the time of execution and the duration in a file
# called last_update.txt
#
#   duration: 0:00.00
#   time:     Sat Jun 17 12:30:02 CEST 2023
#
# You can run this script automatically. For example, add the following to your
# crontab to run it every 15 minutes:
#
#   */15 * * * * /home/user/gitforks/update.sh
#
# (c) Romein van Buren 2023 
# SPDX-License-Identifier: WTFPL
#

set -e

cd /home/romein/gitforks
\time -f "duration: %E" -o last_update.txt ls -1 -d */ | xargs -P10 -I{} git -C {} pull
echo "time:     $(date)" >> last_update.txt