#!/bin/bash

find /pub/multimedia/audio/music/by-artist/ -mindepth 2 -type d | while read ALBUM_DIR; do
    NEWEST_TS=$(find "$ALBUM_DIR" -name '*.mp3' -printf "%T@\n" | sed 's/\..*//' | sort -rn | head -1)
    NEWEST_TOUCH_FORMAT_TSSTR=$(date -d @$NEWEST_TS +%Y%m%d%H%M.%S)
    echo "touch -t $NEWEST_TOUCH_FORMAT_TSSTR \"$ALBUM_DIR\" \"$ALBUM_DIR/.meta\""
done