What I use to keep Slackware updated with wget. Run it when you know of a change or put it in your cron. cd to the mirror path and;
# upgradekg *.tgz
-or- add the command to the script.
I generally run this (cron) one a week or when I get mail on changes. I also perform the upgradepkg after looking through the change log and looking the files directory.
--- Slackware-wget-update --
# Where to put the files
# Where to mirror from. only have one.
wget -o /var/log/slackware-mirror -P $PATHDOWNLOAD --mirror $FTPSITE
# Mail root
mail -s "Slackware mirror" root < /var/log/slackware-mirror
Edit: updatepkg -> upgradepkg.
To much BSD stuff in my head.