LINUX Extract track from MKV

extract_mkv_track.sh

#!/usr/bin/sh

file=$1

if [ -z "$file" ]; then
    echo "USAGE: extract_mkv_track.sh <filename>"
    exit 1;
fi

extension="${file##*.}"

if [ "$extension" != "mkv" ]; then
    echo "The file is not an MKV video."
    exit 1;
fi

# Display available tracks
echo "Available tracks:"
mkvmerge -i "$file"

# Ask the user to choose a track
echo "Enter the track number to extract (ex. 10:track_name.ac3):"
read -r track_number

# Extract the track
mkvextract tracks "$file" "$track_number"

echo "Track has been saved."