Launch multiple PHP processes with a bash script

concurrent-php.sh

#!/usr/bin/env bash

OFFSET=0
LIMIT=200000
TOTAL=1000000000000000
MAX_PROCESS=10

echo "" > nohup.log
tail -f nohup.log &
TAIL_PID=$!

while [ $OFFSET -lt $TOTAL ]
do
    echo "-- Initiating command with offset = $OFFSET"
    nohup php SomeCommand.php $OFFSET >>nohup.log 2>&1 &

    while [ $(ps -ef | grep -v grep | grep php | wc -l) -gt $MAX_PROCESS ]
    do
        printf "." && sleep 1
    done

    OFFSET=$[$OFFSET+$LIMIT]
done

while [ $(ps -ef | grep -v grep | grep php | wc -l) -gt 0 ]
do
    printf "." && sleep 1
done

kill -s 9 $TAIL_PID