yt mp3 Download

#!/bin/bash

# function: guide
help () {
  echo "Youtube URL is required."
}

# function: download audio and convert to mp3
download_and_convert() {
  URLS=$1
  for URL in "${URLS[@]}"
  do
    youtube-dl -f bestaudio $URL --extract-audio --audio-format mp3
  done
}

# check parameter
if [ $# = 0 ]; then
  help
else
  while IFS=\= read URL; do
    URLS+=($URL)
  done < $1
  download_and_convert "$URLS"
fi