How Does Unix Treat Files?

Does Unix treat everything as a file?

Unix treats all devices as files, but with special attributes. To simplify programs, standard input and standard output are the default input and output devices of a program.

How does Unix provide file protection?

Unix allows three forms of access to any file: read, write, and execute. … If you have execute (x) permission, you can ask the shell to run that file as a program. The owner of a file can decide to give any, all, or none of these permissions to each of three classes of people: To the owner of the file him/herself.