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Full Discussion: Crontab on AIX
Top Forums Shell Programming and Scripting Crontab on AIX Post 302522547 by sivarajb on Sunday 15th of May 2011 10:54:41 PM
Old 05-15-2011
FYI,

Quote:
Crontab File:
crontab syntax :
A crontab file has five fields for specifying day ,date and time followed by the command to be run at that interval.
* * * * * command to be executed
- - - - -
| | | | |
| | | | +----- day of week (0 - 6)(Sunday=0)
| | | +------- month (1 - 12)
| | +--------- day of month (1 - 31)
| +----------- hour (0 - 23)
+------------- min (0 - 59)


*in the value field above means all legal values as in braces for that column.
The value column can have a * or a list of elements separated by commas. An element is either a number in the ranges shown above or two numbers in the range
separated by a hyphen (meaning an inclusive range).
Note
Repeat pattern like /2 for every 2 minutes or /10 for every 10 minutes is not supported by all operating systems. If you try to use it and crontab complains it is probably not supported.
The specification of days can be made in two fields: month day and weekday. If both are specified in an entry, they are cumulative meaning both of the entries will get executed .
Crontab Example
A line in crontab file like below removes the core files from /home/someuser/ each day at 6:30 PM.
30 18 * * * rm /home/someuser/core

Changing the parameter values as below will cause this command to run at different time schedule below :

Min Hour day/Month Month day/week Execution TImeay
30 0 1 1,6,12 * - 00:30 Hrs on 1st of Jan, June & Dec.
0 20 * 10 1-5 -8.00 PM every weekday (Mon-Fri) only in Oct.
0 0 1,10,15 * * - midnight on 1st ,10th & 15th of month
5,10 0 10 * 1 - At 12.05,12.10 every Monday & on 10th of every month
month



day/week

Execution time

Last edited by sivarajb; 05-16-2011 at 12:13 AM..
 

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