如果原始图像已被删除，如何查找和删除调整大小的 Wordpress 图像？

Question

This question pertains to the situation where

1. An image was uploaded, say mypicture.jpg
2. Wordpress created multiple copies of it with different resolutions like mypicture-300x500.jpg and mypicture-600x1000.jpg
3. You delete the original image only

In this scenario, the remaining photos on the filesystem are mypicture-300x500.jpg and mypicture-600x1000.jpg .

How can you script this to find these "dangling" images with the missing original and delete the "dangling" images.

Answer 1

I've written a Bash script that will attempt to find the original filename (ie mypicture.jpg ) based on scraping away the WordPress resolution (ie mypicture-300x500.jpg ), and if it's not found, delete the "dangling image" (ie rm -f mypicture-300x500.jpg )

#!/bin/bash

for directory in $(find . -type d)
do
        for image in $(ls $directory)
        do
                echo "The current filename is $image"
                resolution=$(echo $image | rev | cut -f 1 -d "-" | rev | xargs)
                echo "The resolution is $resolution"
                extension=$(echo $resolution | rev| cut -f 1 -d "." | rev | xargs)
                echo "The extension is $extension"
                resolutiononly=$(echo $resolution | sed "s@.$extension@@g")
                echo "The resolution only is $resolutiononly"
                pattern="[0-9]+x[0-9]+"
                if [[ $resolutiononly =~ $pattern ]]; then
                        echo "The pattern matches"
                        originalfilename=$(echo $image | sed "s@-$resolution@.$extension@g")
                        echo "The current filename is $image"
                        echo "The original filename is $originalfilename"
                        if [[ -f "$originalfilename" ]]; then
                                echo "The file exists $originalfilename"
                        else
                                rm -f $directory/$image
                        fi
                else
                        break
                fi
        done
done

Answer 2

You could use find :

$ find . -type f -regex '.*/mypicture-[0-9]+x[0-9]+\.jpg'

This will print a list of files. Check that it is correct and then, instead of printing the names of the files, tell find to delete them:

$ find . -type f -regex '.*/mypicture-[0-9]+x[0-9]+\.jpg' -exec rm -f {} \;

See man find for the explanation.