The Acumen software design blog provides you with helpful articles about Apache.

Several web sites provide a good overview.

Official Apache Overview

Apache Wikipedia

Our ecommerce team was having trouble with Magento cron jobs, so we researched the various mechanisms to test and debug them.  The jobs did not run at the expected time and we couldn’t see why.

Magento

The Magento cron jobs run as apache.  You can see them by typing:

crontab -u apache -l

You can edit them with

crontab -u apache –e

 

To see if they are running without errors:

tail /var/log/cron

 

Also, the results of cron jobs are emailed to your apache user.  You can check that account with:

mail -u myApacheAccount

If you have problems with the cron job permissions, you will see them in the cron log or the mail messages.

 

References

http://www.adminschoice.com/crontab-quick-reference/

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