最大実行数を制限してコマンドを実行するサンプル

sample_queue_job.bash

#!/bin/bash
#
# Sample of job queing
#
#    Copyright (C) 2014 Sunao HARA (hara@okayama-u.ac.jp)
#    Copyright (C) 2014 Abe laboratory, Okayama university
#    Last Modified: 2014/07/11 11:08:14.
#

function queue_job() {
	MAX_JOB=$1; shift
	JOBCMD=$@

	while [ `jobs | wc -l` -ge 2 ];
	do
		# echo "Waiting: $JOBCMD"
		sleep 1
	done

	echo Run: $JOBCMD
	eval $JOBCMD &
}

queue_job 2 'sleep 5 && echo 1'
queue_job 2 'sleep 5 && echo 2'
queue_job 2 'sleep 5 && echo 3'
queue_job 2 'sleep 5 && echo 4'
queue_job 2 'sleep 5 && echo 5'

wait