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Overview of UNIX

Posted By: Shruti Sharma     Category: Unix / Linux / Ubuntu     Views: 3529

This article explains about unix functions, features, components of unix kernel, command, unix file system, directory structure, file permissions etc.

What is UNIX

• UNIX is a kind of operating system which is the interface between hardware and application software.


Functions of UNIX

• Support Programming
• Support many application
• Manage system resources
• Handle daily maintenance


Features of UNIX

• Multi-Tasking
• Multi-User
• Parallel Processing
• Pipe
• Shell
• High Security
• Reliable
• Network Oriented
• Easy to Transpant


Component of UNIX 

Kernel File System Shell Command


Some Conceptions

• Terminal (Graphic & Text)
• Console
• User, Super User
• Group
• Process, Process id
• Foreground Process
• Background Process
• Device
• Raw Device


Login and Logout

• Usually, we use telnet to login Unix System.
• Usually after logging in, the current directory is the HOME directory


Using Unix Command

• Unix Commands are case sensitive.
• Command Syntax
• Command [-option] [arguments]
• Example:
• ls - l /home
• Help
• Man Command


UNIX File System

Four Types of UNIX File
1. Ordinary File (Plain Text and Binary)
2. Directory
3. Special File (Block Device File and Character Device File)
4. Symbolic Link


UNIX Directory Structure



UNIX File Name

• Name of a FIle
• Max. Length is 255 character
• Case sensitive
• No Special Extension Name
• / Root
• . Current Directory
• .. Parent directory of current directory
• .filename hidden file
• ? Wildcard for a single letter
• * Wildcard for a any letter(s)


UNIX File Permission

  
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Shruti Sharma
Shruti Sharma author of Overview of UNIX is from United States. Shruti Sharma says Hello Everyone,
I am Shruti Sharma from United States
 
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