.bashrc

multiple () {
  local l x y p c
  c=0 p=0 l=() 
  while :; do
    case $1 in
      -p)
        if [[ $2 = -* ]]; then
          echo '-p requires an argument'
          return
        fi
        p="$2" 
        shift ;;
      --) shift; break ;;
      *) l+=("$1") ;;
    esac
    shift
  done
  echo
  if (( p > 1 )); then
    for y in "${l[@]}"; do
      (( c++ >= p )) && wait -n
      echo "$* $y"
      "$@" "$y" &
    done
    wait
  else
    for y in "${l[@]}"; do
      echo "$* $y"
      "$@" "$y"
    done
  fi
}