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File permissions are core to almost everything you do on your Linux machine, from viewing a PDF to saving an image and running an app. The core model keeps things simple, but there are quite a few ...

The PDF (portable document format) standard was created in the 1990s by Adobe cofounder John Warnock to make it possible for people to share reliably formatted documents across a wide range of ...

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.