It’s a good ideea to keep them up to date. On the other hand I don’t like automatic updates, something might break when you least want or expect it. So I prefer to be notified of updates and choose myself the moment when to apply them. Following is a nice script that sends an email of available updates on a Debian system.
# Only download updates.
# Nothing is installed.
apt-get -dqq update
apt-get -dyqq upgrade
upgrades=$(apt-get -s upgrade | grep ^Inst)
if [ "$upgrades" ] ; then
echo "$upgrades" | mail -s "Updates for $(hostname) on $(date +%Y-%m-%d)" $EMAIL
Set the above script to run from cron as often as you’d like to get these notifications.