FFMPEG Combine/Merge All (mkv) Videos In a Folder

#!/bin/bash
#if you want to add more filetypes or organize do it yourself in the ls | grep area :P
for filename in $(ls| grep .mkv); do
    echo "file $filename" >> concat-list.txt;
done

ffmpeg -f concat -safe 0 -i concat-list.txt -max_muxing_queue_size 1024 -c copy merged.mkv

rm concat-list.txt