Bash script to convert all wav.ark from a wav.scp file into .wav

ark2wav.sh

#!/bin/bash

speed=100

if [ $# != 2 ];then
    echo "[ERROR] Usage: $0 wav.scp(archived) outdir" && exit 1
fi
wavscp=$1
outdir=$2

mkdir -p $outdir
i=0
while read line; do
    utt=$(echo $line | cut -d " " -f 1)
    ark_path=$(echo $line | cut -d " " -f 2)
    wav-copy $ark_path ${outdir}/${utt}.wav &
    i=$(($i+1));flag=$(($i%$speed));if [ $flag = 0 ]; then wait; fi
done < $wavscp