System UNIX Commands
The UNIX system is composed of three major parts:
Manages the resources of whatever computer system it lives on---to keep track of disks, tapes, printers, terminals, communication lines, and any other devices.
|The File System||Organizing structure for data. Perhaps the most important part of UNIX, the file system is a repository for data and provides the means of organizing the layout of data storage through a directory structure.|
|The Shell||Command interpreter. Although the shell is just a utility program and not properly part of the system, it is the part that the user sees. The Shell listens to your terminal and translates your requests into actions.|