#!/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_TIMESTAMP=$(date -d @$NEWEST_TS +%s)
    echo "echo \"Timestamp: $NEWEST_TIMESTAMP\" >> \"$ALBUM_DIR/.meta\""
done