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10 Cards in this Set
- Front
- Back
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What is UNIX ? |
An operating system |
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What does the OS do? |
It manages the way the computer works by driving the processor, memory, disk drives, keyboards, video monitors, etc. |
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When and why was the Unix OS created ? |
created in the late 1960s as a multiuser, multitasking system for use by programmers. |
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What is the philosophy behind the design of UNIX ? |
To provide simple, yet powerful utilities that could be pieced together in a flexible manner to perform a wide variety of tasks. |
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What's the key difference between the Unix OS and others you are familiar with (e.g., PC) ? |
Unix is designed for multiple users. That is, multiple users may have multiple tasks running simultaneously. |
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What are the main 2 differences between Unix and Linux ? |
1) Unix development has corporate support. This means it's a more stable OS.
(2) Linux is developed by a community of users and is free. There's some stability issues and bugs, but they're quickly squashed and new content, programs, and functionality has quickly outpaced that of Unix. |
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What are the 3 basic entities of the Unix/Linux OS? |
The Kernel. The shell. Utilities. |
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Definition of 'The Kernel' |
The core of the UNIX system.
Loaded at system start up (boot);
manages the entire resources of the system.
Examples of what it does are: interpreting and executing instructions from the shell,
managing the machine’s memory and allocating it to processes,
scheduling the work done by the cpu’s. |
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Define 'The Shell' |
2) The Shell – Whenever you login to a Unix system you are placed in a shell program.
The shell is 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.
Several shells are usually available on any Unix system, each with its own strengths and weaknesses. Examples are the Bourne Shell (sh), C Shell (csh), and Bourne Again Shell (bash). |
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What are 'Utilities' ? |
3) Utilities -- UNIX provides several hundred utility programs, often referred to as commands.
The commands accomplish universal functions such as printing, editing files, etc |
