If you want to sync your portage tree and your layman-overlays with one command, you can use eix-sync for that. All you have to do is to create /etc/eix-sync.conf and place a * in it. If you want to have a cronjob for that create for example a file named /etc/cron.weekly/eix.cron and put something like #!/bin/sh /usr/bin/eix-sync in it. You can then delete all other cronjobs like emerge --sync and layman -S As usual man eix has all the info you need.