Bash one-liner to convert a directory of flac audio files to mp3 V0
$ for file in *.flac; do flac -cd "$file" | lame -h -V0 - "${file%.flac}.mp3"; done
V0 just because -b 320
can be rather silly.
On a Mac using Homebrew, just do the following:
$ brew install lame flac
Ruby Forest Druid.