December 2001
Intermediate to advanced
506 pages
10h 4m
English
book
IBM eServer Certification Study Guide - pSeries AIX System Administration
by Christian Pruett, Kristian Strickland, Scott Vetter
Content preview from IBM eServer Certification Study Guide - pSeries AIX System Administration
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9.6. The cron daemon
The cron daemon runs shell commands at specified dates and times. The following event types are scheduled by the cron daemon:
crontab command events
at command events
batch command events
sync subroutine events
ksh command events
csh command events
The way these events are handled is specified in the /var/adm/cron/queuedefs file.
Regularly scheduled commands can be specified according to the instructions contained in the crontab files. You can submit your crontab file with the crontab command. Use the at command to submit commands that are to be run only once. Because the cron daemon never exits, it should be run only once.
The cron daemon examines crontab files and at command files only when the cron daemon is initialized. When ...
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