File Types
A file is a means by which information is stored on a UNIX system. The commands you issue, the applications you use, the data you store, and the devices you access, such as printers and keyboard, are all contained in files. One aspect of UNIX that makes it both simple and complex: simple because you know that everything out there is a file, complex because the contents of a file could be anything ranging from ASCII text files to executable programs.
Every file on the system has a filename. The operating system takes care of all file-system-related tasks; you just need to know the name of the file and how to use it. Many types of files are on UNIX systems. Some file types are peculiar to the UNIX variant you are using. Device files, ...
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