How to include directories and subdirectories in a batch file

Question

I found a batch file script to do the job I need to do. I posed the question of how to add directories and subdirectories recursively in the batch process in a comment on the post I got this code from, but no one replied after 4 months. I couldn't find an answer to this question searching this site so I figured id start a new thread on the topic.

What I wanted to do was be able to bulk change meta data information in MKV files which was accomplished thusly.

#!/bin/bash

# This script takes all mkv files in the current directory and sets the filename
# (without .mkv) as its title in metadata

for mkvfile in *.mkv; do
mkvpropedit "$mkvfile" -e info -s title="${mkvfile::-4}"
done

How can I modify this to be run on a root directory to include all folders and sub-folders in the process? Thank you!

Answer 1

With bash, you'd set the globstar and nullglob shell options and use ** to recurse into subdirectories:

shopt -s globstar nullglob
for mkvfile in **/*.mkv; do
    mkvpropedit "$mkvfile" -e info -s title="${mkvfile::-4}"
done

See 4.3.2 The Shopt Builtin in the manual.

Note you can also use ${mkvfile%.mkv} to chop off the extension.

You can also use find, but I think it gets pretty ugly

find . -name '*.mkv' -exec sh -c 'mkvpropedit "$1" -e info -s title="$(basename "${1%.mkv}")"' sh {} \;