Add a cronjob for rkhunter

You can add a cronjob for rkhunter to have a checkup every day at a certain hour :

sudo crontab -l

sudo crontab -l > crontab.bak
sudo crontab -e
05 04 * * * /usr/bin/rkhunter --cronjob --update --quiet

It will check the server every day at 04:05 AM.