December 2001
Intermediate to advanced
520 pages
13h 42m
English
Content preview from PHP Advanced for the World Wide Web: Visual QuickPro Guide
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Establishing a Cron
A cron is a service on Unix servers that allows tasks to be scheduled and executed automatically. The cron application runs constantly and will, according to instructions, carry out its orders. These orders are stored in a file called crontab. Crontab is a to-do list that contains lines that might look like this:
30 22 * * * lynx --dump http://www.DMCinsights.com > /dev/null
The crontab format dictates that each line contain six fields separated by spaces or tabs. The first five fields represent, in order, minutes, hours, days, months, and day of the week (from 0 to 6, with 0 being Sunday). Notice that you can specify the day of operation as either a day of the month (1–31) or a day of the week (Sunday through Saturday), ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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