Unix Programs and Computer Systems

By: Jesse Miller

UNIX is a time sharing operating system kernel: a program that controls the resources of a computer and allocates them among its users. It lets users run their programs; it controls the peripheral devices (discs, terminals, printers, etc) connected to the, machine, and it provides a file system that manages the long-term storage of information such as programs, data and documents.

It also has essential programs like compilers, editors, command languages, programs for copying and printing files, and so on. It supports programs designed by you or for you by other programmers such as tools for document preparation, routines for statistical analysis, and graphic packages.

A newcomer finds It difficult to understand and use the facilities available. Basics like logging in and out, simple commands, correct typing mistakes, checking mail, inter-terminal communication, file and file system, printing files, directories, commonly-used commands, file name short hands, redirecting I/P and O/P, pipes, setting erase and kill characters, and most important of all defining your own search path for commands.

UNIX system is full duplex: the characters you type on the keyboard are sent to the system, which sends them back to the terminal to be printed on the screen. Echo process copies the characters directly to the screen, so you can see what you are typing, but sometimes, such as when you are typing a secret password, the echo is turned off so the characters do not appear on the screen.

Quick Note: Taking the Nonsense out of looking for the right spyware remover

If you really want to take the work out of looking for that right Spyware Protection from a go to the Internet and get a or a Free
Download, In order to prevent your vital information from being ripped from your computer get your Remover Today.

Most of the key board characters are ordinary printing characters with no special significance, but few tell the computer how to interpret your typing. By far the most important of these is the RETURN key. The RETURN key signifies the end of a line of input, the system echoes it by moving the terminal`s cursor to the beginning of the next line on the screen. Two other keys which have a special meaning are RUBOUT and BREAK. These keys are also called as BREAK and INTERRUPT. Delete key stops a program immediately, without waiting for it to finish.


The system is capable of dealing with a wide variety of terminals, but it is strongly oriented towards a lower case. The culmination of your login efforts is a prompt, usually a single character, indicating that the system is ready to accept commands from you. It runs on a range of computers from microprocessors to the largest mainframes. It is fun for programmers.

Top Searches on
Computers
 • 
 • 
 • 
 • 
 • 
 • 
 • 
 • 
 • 
 • 
 • 
 • 
 • 
 • 
 • 
 • 
 • 
 • 
 • 
 • 

» More on Computers