This trick can be useful if you want to extract some portion of a file’s name and then reuse it. For example, if you want to find the differences between a number of files with .old extensions and the ...

There's a lot to learn about image files on the command line, from verifying file format to finding out where and when photos were taken and maybe even getting an unusual view of what they look like.

Ever got stuck with a file that has some mysterious extension? Where no matter how much you try, the Jigsaw puzzle doesn’t seem to fit together? So, for instance, if the file has the extension ...