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Full Discussion: Cron Tab entries
Top Forums Shell Programming and Scripting Cron Tab entries Post 302357511 by Shazin on Wednesday 30th of September 2009 03:58:34 AM
Old 09-30-2009
Cron Tab entries

Hi All,

I am required to make a crontab entry, I have the below requirement:
Code:
1. It should execute at 06:15 12:00 and 18:30
2. It should execute every day of the month for all the 30 days

I am going to add the below entry in the crontab file.
Code:
15,0,30 6,12,18 * * 0-6 cd path_of_the_path ; ./script_name

As this is a critical script for my application, we do not require to mess it up even for a single time.

Please advise if it will work fine.

Cheers,
Shazin
 

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CRON(8) 						      System Manager's Manual							   CRON(8)

NAME
cron - daemon to execute scheduled commands (Vixie Cron) SYNOPSIS
cron DESCRIPTION
Cron should be started from /etc/rc or /etc/rc.local. It will return immediately, so you don't need to start it with '&'. Cron searches /var/spool/cron for crontab files which are named after accounts in /etc/passwd; crontabs found are loaded into memory. Cron also searches for /etc/crontab and the files in the /etc/cron.d/ directory, which are in a different format (see crontab(5)). Cron then wakes up every minute, examining all stored crontabs, checking each command to see if it should be run in the current minute. When execut- ing commands, any output is mailed to the owner of the crontab (or to the user named in the MAILTO environment variable in the crontab, if such exists). Additionally, cron checks each minute to see if its spool directory's modtime (or the modtime on /etc/crontab) has changed, and if it has, cron will then examine the modtime on all crontabs and reload those which have changed. Thus cron need not be restarted whenever a crontab file is modified. Note that the Crontab(1) command updates the modtime of the spool directory whenever it changes a crontab. SEE ALSO
crontab(1), crontab(5) AUTHOR
Paul Vixie <paul@vix.com> 4th Berkeley Distribution 20 December 1993 CRON(8)

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