How do I extract a specific file format using binwalk?

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To extract a specific file format using binwalk, you can use the "-D" or "--dd" option followed by the file format extension you want to extract. For example, to extract all JPEG files from an image file:

binwalk -D 'jpeg:jpg' image_file

This command extracts all JPEG files from the image file and saves them in a sub-directory called "imagefile.extracted/" in the current directory. You can replace 'jpeg:jpg' with the file format and extension you want to extract.