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2.  UNIX is a computer Operating System which is
capable of handling activities from multiple users
at the same time. Unix was originated around in
1969 at AT&T Bell Labs by Ken Thompson and
Dennis Ritchie. Global web tutors gives a very
good understanding on Unix.
 The UNIX operating system is a set of programs
that act as a interface between the computer and
the user.
 The computer programs that allocate the system
resources and coordinate all the details of the
computer's internals is called the operating system
or kernel.

4. 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.

5. 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.

6. There are various command and utilities which
you would use in your day to day activities. cp,
mv, cat and grep etc. are few examples of
commands and utilities. There are over 250
standard commands plus numerous others
provided through 3rd party software. All the
commands come along with various optional
options.

7. All data in UNIX is organized into files. All files
are organized into directories. These directories are
organized into a tree-like structure called the file
system.

8.  Type your userid at the login prompt, then press ENTER.
Your userid 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.
 If you provided correct userid and password then you
would be allowed to enter into the system. Read the
information and messages that come up on the screen
something as below.
login : amrood
amrood's password:
Last login: Sun Jun 14 09:32:32 2009 from 62.61.164.73
$

9. Just type logout command at command prompt,
and the system will clean up everything and break
the connection.

10.  Ordinary Files − An ordinary file is a file on the system that
contains data, text, or program instructions. In this tutorial,
you look at working with ordinary files.
 Directories − Directories store both special and ordinary
files. For users familiar with Windows or Mac OS, UNIX
directories are equivalent to folders.
 Special Files − Some special files provide access to
hardware such as hard drives, CD-ROM drives, modems,
and Ethernet adapters. Other special files are similar to
aliases or shortcuts and enable you to access a single file
using different names.

11.  Listing Directories : To list the files in a directory you
can use the following syntax −
$ls dirname
 Creating Directories : Directories are created by the
following command −
$mkdir dirname
 Removing Directories : Directories can be deleted using
the rmdir command as follows −
$rmdir dirname $
 Changing Directories : You can use the cd command to
do more than change to a home directory: You can use
it to change to any directory by specifying a valid
absolute or relative path. The syntax is as follows −
$cd dirname $

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