multit - run multiple system commands via pool

multit.sh

#! /bin/sh

# yet another simple framework to test system calls, sh scripts.

cmd=$1 # a command to run.
parallel=$2 # how many.
frequency=$3 # how often generate instance
pool=$4 # running command in certain pool size.
pool_sleep_time=$5 # how long to wait for a pool to be done.

function usage() {
echo "
USAGE:
    ./multit.sh <command> <parallel> <frequency> <pool> <pool_sleep_time>
"
}

function final() {
if [ $? -eq 0 ]
then
  exit 0
else
  echo "Opps, something went wrong, please review your call"
  exit 1
fi
}

function watch_dog() {
# the following should be equivalent to -> ps -ef |grep -c '[s]leep 5'
firstchar=`echo $cmd | cut -c1`
rest=`echo $cmd | cut -c2-100`
while [ `ps -ef |grep -c "[$firstchar]$rest"` -gt 0 ]; do
        sleep 1
done
}

#TODO: add statitics

[ ! -z "$cmd" ] || usage
[ ! -z "$frequency" ] || frequency=0

for p in `seq 1 $parallel`; do
        nohup $cmd > /dev/null 2>&1 &
        sleep $frequency
done
watch_dog
final