Redirect crond(pam_unix) syslog messages

If you see too many of these lines:

root@s1 trungson]# tail /var/log/messages
Oct 16 12:36:01 s1 crond(pam_unix)[21821]: session closed for user root

Here is how to redirect it to a more appropriate place

[root@s1 trungson]# more /etc/syslog.conf
...
*.info;mail.none;authpriv.none;cron.none;auth.!=info    /var/log/messages
...
# Log cron stuff, add auth.info to redirect cron logging
cron.*;auth.info              /var/log/cron