Resume bash script after reboot
I often write
bash scripts to automate common tasks in my projects. Often the script makes changes that require a reboot. And when the machine finishes rebooting the script needs to resume from where it left.
Following script creates a temporary file that we use as a flag in the script to check if the script is resuming from a reboot. We also temporarily update the
.zshrc to trigger the script automatically after reboot. When the script resumes, we remove the temporary file and the extra line we added in the `bashrc` or `zshrc`.
# filename: reload_bash_shell.sh
# check if the reboot flag file exists.
# We created this file before rebooting.
if [ ! -f /var/run/resume-after-reboot ]; then
echo "running script for the first time.."
# run your scripts here
# Preparation for reboot
# add this script to zsh so it gets triggered immediately after reboot
# change it to .bashrc if using bash shell
echo "$script" >> ~/.zshrc
# create a flag file to check if we are resuming from reboot.
sudo touch /var/run/resume-after-reboot
# reboot here
echo "resuming script after reboot.."
# Remove the line that we added in zshrc
sed -i '/bash/d' ~/.zshrc
# remove the temporary file that we created to check for reboot
sudo rm -f /var/run/resume-after-reboot
# continue with rest of the script