title: How do I check if all files inside directories are valid jpegs (Linux, sh script needed)?
body: <p>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:  </p>
  
  <pre><code>identify -format '%f' whatever.jpg
  </code></pre>
  
  <p>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").</p>
  
  <p>Any ideas how I can probably do that?</p>