Want to convert your music files to mp3 because you've had the same CD in your car for 3 years? I thought so.

mp3_convert.sh

#!/bin/sh

vlc="/Applications/VLC.app/Contents/MacOS/VLC"
ext="mp3"
dest="/Users/ryan/Desktop/mp3/"

for ARG in "$@"; do
	NEWFILE="$dest$(basename "$ARG").$ext"
	$vlc -I dummy -vvv "$ARG" --sout "#transcode{acodec=mp3,ab=128,channels=2,samplerate=44100}:std{mux=raw,dst=\"$NEWFILE\",access=file}" vlc://quit
done

# usage:    $ ./mp3_convert /path/to/my/music\ files/*.m4a