Rip Audio from youtube vid

gistfile1.txt

#!/bin/bash 
# 
# Simple bash script to rip music from a youtube vid. 
# Originally from: http://www.linuxjournal.com/content/grabbing-your-music-youtube-do-it-your-wam 
#
address=$1
regex='v=(.*)'
if [[ $address =~ $regex ]]; then
    echo "Parsing URL" 
    video_id=${BASH_REMATCH[1]}
    video_id=$(echo $video_id | cut -d'&' -f1)
    echo "Getting Title"
    video_title="$(youtube-dl --get-title $address)"
    echo "$video_title"
    echo "Getting filename"
    filename="$(youtube-dl --get-filename $address)"
    echo "$filename"
    youtube-dl $address
    ext=$(echo $filename | cut -d \. -f 2)
    avconv -i "$filename" "$video_title".wav
    lame "$video_title".wav "$video_title".mp3
    rm "$filename" "$video_title".wav
else
    echo "Error!" 
fi