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UNIX is an operating system consisting of three important features; a kernel, the shell and a file system.
As its name implies, the kernel is at the core of each UNIX system and is loaded in whenever the system is started up - referred to as a boot of the system. It manages the entire resources of the system, presenting them to you and every other user as a coherent system. You do not need to know anything about the kernel in order to use a UNIX system. Amongst the functions performed by the kernel are:
Whenever you login to a Unix system you are placed in a program called the shell. You can see its prompt at the bottom left of your screen. To get your work done, you enter commands at this prompt. The shell acts as a command interpreter; it takes each command and passes it to the operating system kernel to be acted upon. It then displays the results of this operation on your screen. The shell provides you with one or more of the following features. You can:
A file system is a logical method for organizing and storing large amounts of information in a way which makes it easy manage. The file system is the smallest unit in which information is stored. The UNIX file system has several important features: