Personal CRON tasks (for Ubuntu)

cron_tasks.sh

#!/bin/bash

# Personal cron tasks script file
# General housekeeping stuff
# Example usage:
# curl -s https://gist.githubusercontent.com/ramit-mitra/32f3844608c2af97fc8a41bcc1f48ee5/raw/cron_tasks.sh | bash

hour=$(date +"%H")
minute=$(date +"%M")

if true; then
	# do nothing
	echo "--- running cron script \n"
fi

# runs every hour
if (( $hour % 1 == 0 )) && [ "$minute" = "00" ]; then
	# update packages
	apt update -y
	apt upgrade -y
	apt autoremove -y
	# restart services (just to be safe)
	systemctl restart ufw nextdns
fi

# runs every 6 hour
if (( $hour % 4 == 0 )) && [ "$minute" = "05" ]; then
	# restart nginx
	systemctl restart nginx
	# renew ssl certs
	certbot renew --post-hook "systemctl reload nginx"
	# clear the swap memory
	swapoff -a
	swapon -a
fi

# runs every 12 hour
if (( $hour % 12 == 0 )) && [ "$minute" = "10" ]; then
	echo "do nothing"
	# import blocklisted IPs
	# curl -s  https://gist.githubusercontent.com/ramit-mitra/f5e9c4f9adc4a155ebcce2608bc50f39/raw/block_banned_ips.sh | bash
fi

# log message
echo "----- Cron tasks executed at $(date) \n"