How do I check if all files inside directories are valid jpegs (Linux, sh script needed)?

Question

Ok, I got a directory (for instance, named '/photos') in which there are different directories (like '/photos/wedding', '/photos/birthday', '/photos/graduation', etc...) which have .jpg files in them. Unfortunately, some of jpeg files are broken. I need to find a way how to determine, which files are broken. I found out, that there is tool named imagemagic, which can help a lot. If you use it like this:

identify -format '%f' whatever.jpg

it prints the name of the file only if file is valid, if it is not it prints something like "identify: Not a JPEG file: starts with 0x69 0x75 `whatever.jpg' @ jpeg.c/EmitMessage/232.". So the correct solution should be find all files ending with ".jpg", apply to them "identify", and if the result is just the name of the file - don't do anything, and if the result is different from the name of the file - then save the name of the file somethere (like in a file "errors.txt").

Any ideas how I can probably do that?

Answer 1

The short-short version:

find . -iname "*.jpg" -exec jpeginfo -c {} \; | grep -E "WARNING|ERROR"

You might not need the same find options, but jpeginfo was the solution that worked for me:

find . -type f -iname "*.jpg" -o -iname "*.jpeg"| xargs jpeginfo -c | grep -E "WARNING|ERROR" | cut -d " " -f 1

as a script (as requested in this question)

#!/bin/sh
find . -type f \
\( -iname "*.jpg" \
 -o -iname "*.jpeg" \) \
-exec jpeginfo -c {} \; | \
grep -E "WARNING|ERROR" | \
cut -d " " -f 1

I was clued into jpeginfo for this by http://www.commandlinefu.com/commands/view/2352/find-corrupted-jpeg-image-files and this explained mixing find -o OR with -exec