Extracting jpg/jpeg files from multiple .zip files

Question

I have a folder with over 200 .zip files. In each of these files there is only one folder with several types of archives in it (sometimes, this folder is missing). Among them, I want to extract only the .jpg or .jpeg file. The estructure of the zip file is:

AAAA-99999-2015.zip
     AAAA-99999-2015 (optional)
          AAAA-99999-2015.jpg (or .jpeg)
          AAAA-99999-2015.prj
          AAAA-99999-2015.ecw
          readme.txt

¿How can I automate this task without manually have to open all these 200 archives?

Answer 1

You could do something like this

find . -type f -iname \*zip -print0 | xargs -0 --max-args=1 --replace unzip {} \*.jpg \*.jpeg

This would look in the current folder and sub-folders for files called "*.zip", then for each one of them, individually (--max-args=1) the command unzip is called, appending \*.jpg \*.jpeg, thereby selecting the files to extract.

(If we select both *.jpeg and *.jpg files and some of these do not exist unzip may warn us about that. This can be safely ignored.)

If you wish to test what happens first, insert an echo:

find . -type f -iname \*zip -print0 | xargs -0 --max-args=1 --replace echo unzip {} \*.jpg \*.jpeg

If you with to extract all files in the current folder, irrespective of where they are inside the ZIP file, add the -j option to unzip:

find . -type f -iname \*zip -print0 | xargs -0 --max-args=1 --replace unzip -j {} \*.jpg \*.jpeg

You can also add a target folder by using -d foldername after the -j.