Control Spotify from Terminal on Mac OS

spotify.sh

alias macdre='spotify spotify:artist:4sv6VJ2QZlaSosz3kFlxQH'
alias slaps="spotify $SPOTIFY_DEFAULT_PLAYLIST"

function spotify()
{
    spotify_osa "play track \"$1\""
}

function spotify_osa()
{
    SCRIPT="
    tell application \"Spotify\"
        $*
    end tell
    "

    #echo "$SCRIPT"
    osascript -e "$SCRIPT"
}

function track()
{
    spotify_osa "
        set trackArtist to artist of current track as string
        set trackName to name of current track as string
        set trackUrl to spotify url of current track as string

        set output to (trackArtist & \" - \" & trackName & \"  [ \" & trackUrl & \" ]\")
        do shell script \"echo \" & quoted form of output

    "
}

alias next='spotify_osa "next track"'
alias prev='spotify_osa "previous track"'
alias pause='spotify_osa "pause"'
alias play='spotify_osa "play"'
alias back='prev'