Unix

Unix (officially trademarked as UNIX, sometimes also written as Unix with small caps) is a computer operating system originally developed in 1969 by a group of AT&T employees at Bell Labs, including Ken Thompson, Dennis Ritchie, Douglas McIlroy, and Joe Ossanna. Today's Unix systems are split into various branches, developed over time by AT&T as well as various commercial vendors and non-profit organizations. As of 2007, the owner of the trademark is The Open Group, an industry standards consortium. Only systems fully compliant with and certified to the Single UNIX Specification are qualified to use the trademark; others are called "Unix system-like" or "Unix-like". During the late 1970s and early 1980s, the influence of Unix in academic circles led to large-scale adoption of Unix (particularly of the BSD variant, originating from the University of California, Berkeley) by commercial startups, the most notable of which are Solaris, HP-UX, and AIX. Today, in addition to certified Unix systems, Unix-like operating systems such as Linux and BSD are commonly encountered. Sometimes, "traditional Unix" may be used to describe a Unix or an operating system that has the characteristics of either Version 7 Unix or UNIX System V. Contents

No. This is a common misconception. The source code to Unix operating systems has traditionally been licensed to vendors, but the code was never made available to most users. Some of the code from Unix systems prior to System III was released under a BSD license in 2002, but most System III and later code is still proprietary.

A command is something that's built-in to the kernel, where as the utility is something that runs on top of the kernel. Example of utilities are: fdisk, copy, edit, etc.

It depends on the version of the operating system and how it is configured. You would need to look at the MAX_PATH setting to determine what the exact maximum is for a path name.

In general, you should be able to get at least 255 characters and possibly much more depending on the system.

A shell script is used to automatically enter a series of commands without having to make the user type them out.

A majority of servers, including most of the Internet, run on Linux or other Unix-like operating systems. As a desktop platform, it is used in Mac OS X, and some (particularly Linux distributions) are mainly used by more technically savvy users or hobbyists. The wide range of distributions (or "distros") means that there is a flavor for everyone. Additionally, the Linux kernel is used in the Android mobile phone operating system.

soalris 9 support:

* it only support terabyes

* only init phase no SMF services

* no zones concepts

solaris 10 support

* supports petabytes and zfs(zeta filesystems

* uses svcs services and SMF

* supports zones

more than ,

grub bootloader for x86 sytem, and NFSv4 is introduced.

differance between solaris 9 and sol 10

1. SMF - service management facilty

2. Zone

3. ZFS - Zeta Byte file system

4. Nfs 4.0 version

5. Multi terabyte file system (up to 16 TB ) in sol 9 1 TB only

6. Passwd authentication Sol 9 - 16 characters

sol 10 - 256 characters

It is a system software and all the processes in the operating system can be controlled by the user.

Linux shell scripting tutorials are available as pdf files or videos where a lecturer speaks over a video of a computer console. This is where you can watch someone code in the bash environment and follow along.

There are many ways to do this, but the fastest and easiest is to use the 'uptime' command, which will tell you in a summary line how many users are logged in.

Yes

it is a command in unix and unix like operating systems that places a string on the computer terminal.It is typically used in shell scripts and bath files screen or a file.

Once upon a time, all computers were controlled by typing instructions. There was no GUI 'Graphic User Interface' as on modern computers. Whilst there is nothing wrong in using GUI entirely, some users would rather use the CLI 'Command Line Interface' on a terminal, either entirely or partly. Provided the user knows the code to type, it is often faster using CLI than the mouse and GUI.

input="yes"

while [[ $input = "yes" ]]

do

echo "------------"

echo "Calculator"

echo "------------"

PS3="Press 1 for Addition, 2 for subtraction, 3 for multiplication and 4 for division: "

select math in Addition Subtraction Multiplication Division

do

case "$math" in

Addition)

echo "Enter first no:"

read num1

echo "Enter second no:"

read num2

result=<code>expr $num1 + $num2</code>

echo Answer: $result

break

;;

Subtraction)

echo "Enter first no:"

read num1

echo "Enter second no:"

read num2

result=<code>expr $num1 - $num2</code>

echo Answer: $result

break

;;

Multiplication)

echo "Enter first no:"

read num1

echo "Enter second no:"

read num2

result=<code>expr $num1 \* $num2</code>

echo Answer: $result

break

;;

Division)

echo "Enter first no:"

read num1

echo "Enter second no:"

read num2

result=$(expr "scale=2; $num1/$num2" | bc)

echo Answer = $result

break

;;

*)

echo Choose 1 to 4 only!!!!

break

;;

esac

done

echo "Do you want to calculate again(yes/no):"

read input

echo "Thank you for using this program"

done

Several different versions of UNIX have GUI's or Graphical User Interfaces.

The most common example of UNIX with an interface is Mac OS X.

iwconfig

UNIX was named as a play on the earlier operating system MULTICS, which stands for "Multiplexed Information and Computing Service." The developers of UNIX, particularly Ken Thompson and Dennis Ritchie, wanted a simpler, more efficient alternative, and they humorously referred to it as "UNICS," short for "Uniplexed Information and Computing Service." This was eventually shortened to "UNIX." The name reflects its purpose as a single-user version of a multi-user operating system.

In 1984, another factor brought added attention to UNIX system

The shell is both a command language and a programming language that provides an interface to the UNIX operating system (Bourne, 1978).

The shell is the part of the operating system that the user interacts with, and is arguably the most important part of the operating system. Files can be created, renamed, moved and read from the shell. Computer hardware can be installed, used and removed through the shells. Program applications and scripting can be written, compiled, and ran through the shell.