How To Convert Multiple FLAC or M4A Files In A Folder To WAV

1. 'cd' into the folder where the FLAC files are.

2. copy & paste the following:

for f in *.flac ; do ffmpeg -i "${f}" "${f%.*}.wav" ; done

USER:~ $ cd
USER:~ $ cd /Users/FOLDER
USER:FOLDER       $ for f in *.flac ; do ffmpeg -i "${f}" "${f%.*}.wav" ; done
ffmpeg version 4.4 Copyright (c) 2000-2021 the FFmpeg developers

Converting .mp4 files to .wav:

for file in *.m4a; do ffmpeg -i "$file" "${file%.m4a}.wav"; done