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Sample code for cron job automation ( Create a certbot auto-renewal cron job )
#!/bin/bash
# If our cron job already exists, bail out.
if ! crontab -l &> /dev/null | grep -q "/usr/bin/certbot renew"; then
# Copy the existing cron jobs into a temporary file
crontab -l &> /dev/null > cronjobs.txt
# Add our new cron job to the file
echo "15 3 * * * /usr/bin/certbot renew --quiet" >> cronjobs.txt
# Replace content of current user crontab with the content from our cron jobs file
cat cronjobs.txt > /var/spool/cron/crontabs/"$USER"
# Remove the temporary file
rm cronjobs.txt
fi
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