Information Technology Issues

Cron / Crontab

Here is the syntax:

string         meaning
------         -------
@reboot        Run once, at startup.
@yearly        Run once a year, "0 0 1 1 *"
@annually      (same as @yearly)
@monthly       Run once a month, "0 0 1 * *"
@weekly        Run once a week, "0 0 * * 0"
@daily         Run once a day, "0 0 * * *"
@midnight      (same as @daily)
@hourly        Run once an hour, "0 * * * *"

# Minute   Hour   Day of Month       Month          Day of Week        Command    
# (0-59)  (0-23)     (1-31)    (1-12 or Jan-Dec)  (0-6 or Sun-Sat)

Ex: 0 * * * * lynx -dump http://www.semenit.com/crontab.php
Meaning: execute http://www.semenit.com/crontab.php every 1 hour.

Ex: 0 */2 * * * lynx -dump http://www.semenit.com/crontab.php
Meaning: execute http://www.semenit.com/crontab.php every 2 hour.

Ex: */5 * * * * lynx -dump http://www.semenit.com/crontab.php
Meaning: execute http://www.semenit.com/crontab.php every 5 minute.

Ex: 0 1 14 * * lynx -dump http://www.semenit.com/crontab.php
Meaning: execute http://www.semenit.com/crontab.php 1AM on the 14th every month.

Posted in: Hosting, PHP

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