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UNIX What Is Unix: Unix (all-caps UNIX for the trademark) is a family of multitasking, multiuser computer operating systems that derive from the original AT&T Unix, developed in the 1970s at the Bell Labs research center by Ken Thompson, Dennis Ritchie, and others.
UNIX INTRODUCTION: The /etc/password File Groups The /etc/group File Passwords Adding Users Deleting Users Modifying User Attributes The Login Process/etc/profile and .profile Communicating with Users: /etc/ motd
UNIX File System Basics The Hierarchy Files Directories Device Files Character and Block Devices The/dev Directory Links Symbolic Links A File System Tour
UNIX Unix was originally developed in 1969 by a group of AT&T
employees at Bell Labs, including Ken Thompson, Dennis Ritchie, Douglas McIlroy, and Joe Ossanna. There are various Unix variants available in the market.
Solaris Unix, AIX, HP Unix and BSD are few examples. Linux is also a flavor of Unix which is freely available. Several people can use a UNIX computer at the same time;
hence UNIX is called a multiuser system.
UNIX ď‚— Kernel: The kernel is the heart of the operating system. It
interacts with hardware and most of the tasks like memory management, tash scheduling and file management. ď‚— Shell: The shell is the utility that processes your requests.
When you type in a command at your terminal, the shell interprets the command and calls the program that you want. The shell uses standard syntax for all commands. C Shell, Bourne Shell and Korn Shell are most famous shells which are available with most of the Unix variants.
UNIX
UNIX Have your user id (user identification) and
password ready. Contact your system administrator if you don't have these yet. Type your user id at the login prompt, then press
ENTER. Your user id is case-sensitive, so be sure you type it exactly as your system administrator instructed. Type your password at the password prompt, then
press ENTER. Your password is also case-sensitive.
UNIX Disk Management: Making a File System The mkfs Command Sharing File systems The mount Command The fstab File The fsck Command The lost+found Directory The prtvtoc Command
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