xargsでパラレル実行

pdispatcher.sh

#!/bin/sh

# seq 1 4 | xargs -I REP -P 4 ./pdispatcher.sh \REP
# => process a
# => process b
# => process c
# => process d

case $1 in
  "1" ) sleep 1 && echo process a ;;
  "2" ) sleep 1 && echo process b ;;
  "3" ) sleep 1 && echo process c ;;
  "4" ) sleep 1 && echo process d ;;
  * ) echo unknown pattern $1 && exit 1
esac

exit 0