删除多余的图片，实际上数据库也进行了精简，可以让WordPress网站加载更快，也是一种优化方法。
for id in $(wp db query "SELECT ID FROM wp_posts WHERE post_date>='2022-10-01' AND post_date<='2022-10-30' AND post_type='attachment' AND post_parent=0" --silent --skip-column-names)
do
wp post delete --force $id
done
