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Full Discussion: Cronjob Activation
Top Forums Shell Programming and Scripting Cronjob Activation Post 302164395 by Raynon on Monday 4th of February 2008 07:57:08 PM
Old 02-04-2008
Quote:
Originally Posted by Smiling Dragon
Depends on your cron implementation but generally it will run another copy of the script 10 mins after the first one is started - regardless of how long the first run takes.

Solutions:
  • Make your script reentrant - ie write it such that it running multiple times at once isn't a problem.
  • Make your script aware of how many times it's currently running - ie create a lock file when it starts up and check for this every time you start.
  • Don't use cron, have the script run continuously and manage it's own scheduling - ie sleep 600
  • Don't use cron, get a better scheduler - depending on your enviornment, this could be something like anacron or control-m.

Hi,

Running the script continously means to say that i have to leave a command prompt window always open. Once closed, the process will be ended, and also another disadvantage is that a infinite looping script will eat up alot of resources, wouldn;t it ?
So i still think cron is the more practical one. But i have no idea about anacron or control-m. Can you enlightened me on that ?

Can you give an example of script being re-entrant ?
I was thinking if i could make the script check for the process to see if the previous process have been completed, can any experts give me some examples of this ? I am using csh by the way.
 

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

NAME
service - run a System V init script SYNOPSIS
service SCRIPT COMMAND [OPTIONS] service --status-all service --help | -h | --version DESCRIPTION
service runs a System V init script in as predictable an environment as possible, removing most environment variables and with the current working directory set to /. The SCRIPT parameter specifies a System V init script, located in /etc/init.d/SCRIPT. The supported values of COMMAND depend on the invoked script. service passes COMMAND and OPTIONS to the init script unmodified. All scripts should support at least the start and stop commands. As a special case, if COMMAND is --full-restart, the script is run twice, first with the stop command, then with the start com- mand. service --status-all runs all init scripts, in alphabetical order, with the status command. EXIT CODES
service calls the init script and returns the status returned by it. FILES
/etc/init.d The directory containing System V init scripts. ENVIRONMENT
LANG, TERM The only environment variables passed to the init scripts. SEE ALSO
/etc/init.d/skeleton, update-rc.d(8), init(8), invoke-rc.d(8). Jan 2006 service(8)
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