[CentOS] missing run-parts in /etc/crontab

[Andy Holt]

> http://www.linuxtopia.org/online_books/rhel6/rhel_6_migration_guide/rhel_6_migration_ch04s13.html

Horse's mouth better?  The EL 6.1 version is at

http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Migration_Planning_Guide/ch04s14.html