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04-12-2008
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Background Process Shell Scripting
I have a following program:
echofunc() { filename=$1 echo "reading $filename" while read line do echo $line; sleep 6; done < $filename } split -5 new.dat ls x* > input.dat while read file do echofun $file & done < input.dat ==================================================================================================== ================================ Here new.dat is a file which has many 300 line of records in it. So after split 60 files will be formed. So in this program how do I limit only 10 instances of echofun() to run at a time ? Last edited by dhieraj; 04-12-2008 at 09:08 AM. 
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04-12-2008
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The following script show a possible way (the SUBMIT_JOB_LIMIT is set the maximun instance count) :
Code:
#!/usr/bin/bash
#submit_jobs
the_job() {
echo "$(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
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
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