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Full Discussion: Issue in running a command line utility in CRON
Top Forums Shell Programming and Scripting Issue in running a command line utility in CRON Post 302913261 by vai_sh on Thursday 14th of August 2014 09:44:07 PM
Old 08-14-2014
Issue in running a command line utility in CRON
Hi Everyone!

I am facing an issue in running a command line utility from the CRON.

This utility displays IPC statistics on UNIX message queues: The "queue name" and the "count" of messages in the queue.
When running this utility from prompt, it will provide an output on the screen, like the below:

Code:
>ABC

====================================================
Line  Queue Name         In-queue     %Used  Queue-Size  Status
=====================================================
   1  q1                              0        0%           1             RdBlk
   2  q2                              0        0%           1             RdBlk

BUT, when I schedule this command in the CRON, like below, it gives out nothing:

Code:
>crontab -l
* * * * * /path/to/utility/ABC ) >>/tmp/output

Code:
>cat /tmp/output
>


Request your advise on the issue: why the same command is not outputing the required statistics when used in CRON.

Basically I want to process the output of the command in a script to prepare reports/ setting up alerts etc, and use this script in the CRON.

Please let me know what more info is required.

NOTE: The above utility is supplied by a software vendor.

Thanks in Advance!
VS
Last edited by Don Cragun; 08-15-2014 at 12:00 AM.. Reason: Change ICODE tags to CODE tags.
 

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LEARN ABOUT OPENSOLARIS

queuedefs

queuedefs(4)							   File Formats 						      queuedefs(4)

NAME

       queuedefs - queue description file for at, batch, and cron

SYNOPSIS

       /etc/cron.d/queuedefs

DESCRIPTION

       The queuedefs file describes the characteristics of the queues managed by cron(1M). Each non-comment line in this file describes one queue.
       The format of the lines are as follows:

       q.[njobj][nicen][nwaitw]

       The fields in this line are:

       q	The name of the queue. a is the default queue for jobs started by at(1); b is the default queue for jobs  started  by  batch  (see
		at(1)); c is the default queue for jobs run from a crontab(1) file.

       njob	The  maximum  number of jobs that can be run simultaneously in that queue; if more than njob jobs are ready to run, only the first
		njob jobs will be run, and the others will be run as jobs that are currently running terminate.  The default value is  100.

       nice	The nice(1) value to give to all jobs in that queue that are not run with a user ID of super-user.  The default value is 2.

       nwait	The number of seconds to wait before rescheduling a job that was deferred because more than njob jobs were running in  that  job's
		queue, or because the system-wide limit of jobs executing has been reached.  The default value is 60.

       Lines beginning with # are comments, and are ignored.

EXAMPLES

       Example 1 A sample file.

	 #
	 #
	 a.4j1n
	 b.2j2n90w

       This  file  specifies that the a queue, for at jobs, can have up to 4 jobs running simultaneously; those jobs will be run with a nice value
       of 1.  As no nwait value was given, if a job cannot be run because too many other jobs are running cron will wait 60 seconds before  trying
       again to run it.

       The  b  queue, for batch(1) jobs, can have up to 2 jobs running simultaneously; those jobs will be run with a nice(1) value of 2.  If a job
       cannot be run because too many other jobs are running, cron(1M) will wait 90 seconds before trying again to run it. All	other  queues  can
       have up to 100 jobs running simultaneously; they will be run with a nice value of 2, and if a job cannot be run because too many other jobs
       are running cron will wait 60 seconds before trying again to run it.

FILES

       /etc/cron.d/queuedefs	queue description file for  at, batch, and  cron.

SEE ALSO

       at(1), crontab(1), nice(1), cron(1M)

SunOS 5.11							    1 Mar 1994							      queuedefs(4)
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