random/rename-subs

#!/bin/sh

# It renames the .srt files in a directory to match the .mp4 movie names (since those are the formats I usually need).
# If the subtitles are in a subfolder, the script should still work as long as there's only one .srt file.
# It makes the subs discoverable by virtually any video player.

for f in *.mp4; do
    if [ -f "$f" ]; then
        h=$(basename "$f" .mp4)
        echo "Renaming the subtitle (if any) accompanying $h.mp4..."
        n=$(find . -maxdepth 2 -name "*.srt" -printf '.' | wc -m)
        if [ $n -eq 1 ] && ! [ -f $h.srt ]; then
            find . -maxdepth 2 -name "*.srt" -exec mv {} $h.srt \;
            echo "Done!"
        else
            echo "Unable to find unique srt file that needs to be renamed."
        fi
    fi
done