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Full Discussion: Background Process Shell Scripting
Top Forums Shell Programming and Scripting Background Process Shell Scripting Post 302184701 by aigles on Saturday 12th of April 2008 01:43:41 PM
Old 04-12-2008
The following script show a possible way (the SUBMIT_JOB_LIMIT is set the maximun instance count) :

Code:
#!/usr/bin/bash
#submit_jobs

the_job() {
   echo "$(date +%T) - Start of job $1"
   sleep $((RANDOM % 30))
   echo "$(date +%T) - End   of job $1"
}

SUBMIT_JOB_LIMIT=5
SUBMIT_JOB_SLEEP=5

submit_job() {
   job_act=$(jobs | wc -l)
   while ((job_act >= $SUBMIT_JOB_LIMIT))
   do
      sleep $SUBMIT_JOB_SLEEP
      job_act=$(jobs | wc -l)
   done
   (( job_cnt += 1 ))
   the_job $job_cnt &
}

for ((i=1; i<=10; i++))
do
   submit_job $i
done

An execution example :
Code:
$ submit_jobs
19:37:38 - Start of job 3
19:37:39 - Start of job 4
19:37:39 - Start of job 5
19:37:38 - Start of job 1
19:37:38 - Start of job 2
19:37:40 - End   of job 1
19:37:45 - Start of job 6
19:37:47 - End   of job 3
19:37:51 - Start of job 7
19:37:52 - End   of job 2
19:37:55 - End   of job 6
19:37:56 - Start of job 8
19:37:56 - Start of job 9
19:37:58 - End   of job 4
19:37:59 - End   of job 5
$ 19:38:02 - Start of job 10
19:38:06 - End   of job 9
19:38:14 - End   of job 8
19:38:20 - End   of job 7
19:38:29 - End   of job 10

Jean-Pierre.
 

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LEARN ABOUT REDHAT

faxq

faxq(1) 						       mgetty+sendfax manual							   faxq(1)

NAME

       faxq - display fax jobs queued by faxspool(1)

SYNOPSIS

       faxq [-osa] [-v] [-r] [-P<job><prio>]

DESCRIPTION

       Display the fax queue set up by faxspool(1).

       faxq looks for all the jobs queued by faxspool(1) to /var/spool/fax/outgoing/*. For each job in the queue, faxq displays some status infor-
       mations about it. If no options are specified, one line per queued fax job is printed, displaying the job number, sender, number  of  pages
       and target fax number.

OPTIONS

       -v     Tells faxq to print a more verbose report for each job (multiple lines).

       -o     Show old jobs, already sent but still in the queue directory, too.

       -s     Show suspended jobs (stopped because of too many fatal errors during sending). You can restart those jobs with faxq -r

       -a     Show all jobs (active, old, suspended).

       -r     Restart  suspended  jobs.  Every	suspended  job	in the queue (that you have write permissions for) will be requeued.  Use faxrm to
	      delete jobs that you do not want to be sent!

       -P <job> <prio>
	      Change the priority of fax job <job> to <prio>. Example: "faxq -P F000247 3".

BUGS

       faxq doesn't handle time scheduling yet.

SEE ALSO

       faxrunq(1), faxspool(1), faxrm(1), faxqueue(5)

AUTHOR

       faxq is Copyright (C) 1993 by Gert Doering, <gert@greenie.muc.de>.

greenie 							     27 Oct 93								   faxq(1)
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