Well, compared to the previous script, this one is a short one. It’ll find all Matroska containers lacking a corresponding thumbnail (-thumb.jpg or .tbn) file.

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#!/opt/bin/bash

# Find all episodes/movies missing a thumb file

MKV="$( find . -name "*.mkv" | sed "s,./,," | sort )"

echo "These videos are missing a thumbnail file:"
echo ""
for mkv in $MKV; do
        basename="${mkv%.*}"

        # Check if there is a <xbmc11 thumbnail file
        if [ -f "$basename.tbn" ] ; then
                :
        elif [ -f "$basename-thumb.jpg" ] ; then
                :
        else
                echo "  - $basename.mkv"
        fi
done
echo