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Full Discussion: Scheduling cron job
Operating Systems Linux Red Hat Scheduling cron job Post 302823317 by rbatte1 on Wednesday 19th of June 2013 06:26:48 AM
Old 06-19-2013
Possibly better to wrap your script as a loop, e.g.
Code:
#!/bin/ksh
lastsec=-1         # Set to an invalid second count to ensure an immediate start.
while true
do
   currsec=`date +%S`
   ((testsec=$currsec/5))
   ((testsec=$testsec*5))
   if [ $testsec -eq $currsec -a $testsec -ne $lastsec ]
   then
      run-your-code-here
   else
      sleep 1
   fi
   lastsec=$currsec
done

Of course, this never ends unless you put an exit in the code somewhere. You could consider testing for the minute to have passed and end, then schedule it with cron every minute, that way if it ever crashed out, it would be started again.

Not a great way, but it's an option. One wonders why you need to run it every five seconds. Can you enlighten us?


Anyway, I hope that this helps or gives you useful thoughts.


Robin
Liverpool/Blackburn
UK
 

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LEARN ABOUT PLAN9

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 5.10							    1 Mar 1994							      queuedefs(4)
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