/etc/periodic/weekly:

number of jobs: 7 Job Runs by Default What it does 120.clean-kvmdb
YES
Uses find(1) to delete kernel database files in /var/db more that 7 days old. 300.uucp
YES
Local cleanup of UUCP files. This is for backwards compatibility. /usr/libexec/uucp/clean.weekly doesn't exist by default, so it fails.
Note: It is not clear to this author if UUCP is still in general use. uuclean.weekly is not documented. 310.locate
YES
Rebuilds locate(1) database (/var/db/locate.database) by running /usr/libexec/locate.updatedb
Note: This author created a printed article for Daemon News (Configuring Locate Issue 5, 2001) on this subject. 320.whatis
YES
Rebuilds whatis(1) database (/var/db/locate.database) by running /usr/libexec/makewhatis.local.
Note: See makewhatis(1) for details. 330.catman
NO
Reformats manual pages by running /usr/libexec/catman.local. 340.noid
NO
Check for files belongs to an unknown user or unknown group using the very ubiquitious find(1). 999.local
YES
Runs /etc/weekly.local.