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Top Forums Shell Programming and Scripting How to add conditional check of whether a process is running before doing rest of script? Post 302854065 by nbsparks on Monday 16th of September 2013 05:13:27 PM
Old 09-16-2013
How to add conditional check of whether a process is running before doing rest of script?

Hi,

I'm looking at doing a cron job for a script that could take a very short time to complete or a very long time to complete based on variable activity on a server. I don't want to do a weird schedule, but I don't want to be so aggressive that the process attempts to start before another instance has started.

How do I put in a check to see if a process (in this case, "overviewer.py") is still running, and if so, end the script without starting another instance of overviewer.py?

Thank you!
 

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started(7)						 Miscellaneous Information Manual						started(7)

NAME
       started - event signalling that a job is running

SYNOPSIS
       started JOB=JOB INSTANCE=INSTANCE [ENV]...

DESCRIPTION
       The  started  event is generated by the Upstart init(8) daemon when an instance of a job has finished starting and is now running.  The JOB
       environment variable contains the job name, and the INSTANCE environment variable contains the instance name which will be empty  for  sin-
       gle-instance jobs.

       init(8)	emits this event as an informational signal, services and tasks started or stopped by this event will do so in parallel with other
       activity.  It is typically combined with the stopping(7) event by services declaring a dependency.

       Job configuration files may use the export stanza to export environment variables from their own environment into the started  event.   See
       init(5) for more details.

EXAMPLE
       A service that wishes to depend on another service might use:

	      start on started apache
	      stop on stopping apache

       A task that must be run after another task or service has been started might use:

	      start on started postgresql

SEE ALSO
       starting(7) stopping(7) stopped(7) init(5)

Upstart 							    2009-07-09								started(7)
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