Unix

Unix is MUMP (Multi User Multi Porgramming) operating system. I has many features like multitasking, file level security, networking, Portability ..etc. It found by Ken Thomson in 1969.

Xenix is the version of Unix operating system that is use for different microcomputers. It is a framework that runs easily and licensed by Microsoft Corporation at AT & T Laboratories. As I know that all internal Microsoft email transport was done on Xenix-based, so we can say it is the biggest version of the operating system. In these days most of the IT companies are hiring for the Xenix jobs on the profile as administrator, developer, designer and many more other profiles.

Matthias Ettrich started KDE development in 1996.

UNIX commands are designed to be simple in the first place; they basically do one task per command. To make a more powerful sequence, just put (or pipe) several commands together in a sequence.

The ability to use many of the commands in different scenarios just by the command sequence is very powerful; the individual commands do not have to be that powerful or complex, but the result of using several of them in a row makes for a very powerful system.

wild cards are a special set of character used by the shell to match file name .A wild card "Stand in" for other character of the file name .The file name pattern is formed by ordinary character and meta character using well defined rules .

When the pattern is used as an arguments with a command , the shell first suitably expand the arguments and then executes the command . The use of wild card make easier to deal with file in UNIX

* any number of character - including zero character

? single character

[abc] single character - either a,b,c

[a-d] any single character in the range of a to d

[!abc] a single character that is not a, b, and c

[!a-d] any character not in the range of a to d

This is not a true statement; passwords in any operating system may be compromised by using weak or easily guessed passwords.

Use the 'wc' command:

wc myfile[123].txt

comm is stand for - finding what is common.

The comm command reads two sorted files,file1,and file2,to produce a three-column output. The first column gives lines that exist only in file1; the second column displays lines that exist only in file2; and the third column shows the lines common in both files.

//hop helpful thanks

In a recent court case it was decided that Novell owns the right to the source code.

Solaris is a licensed product; you cannot download it for free. However, a free version, OpenSolaris, can be downloaded.

well first off, im not an expert. but for what i know its something like this.

synchronization is like keeping access to shared data with locks.

learning threads might be good for you to somewhat get a grasp of what synchronization is about.

uname -a

Yes, if the system has a library known as "Wine" installed.

Anyone can use these systems.

The Solaris operating system is available for free from the Sun website and is available on multiple computer platforms. If Linux is more your bag, that system is also available for free from a variety of vendors and websites.

Most people who choose to use these systems are interested in computers or are vocationally required to deal with computers. That is to say that most business and casual applications are written for windows and more people are familiar with windows.

If you are referring to the desktop as being a graphical user interface then Unix is capable of running without it. A GUI was a more recent addition to Unix, meaning that the earlier versions just used a command line and had no desktop environment at all.

Today, you can install versions of Unix or Linux that do not have a graphical component at all, and several administrators (such as myself) prefer not to use a desktop.

You don't need a shell script to do that. Since you don't say what 10 shell variables you want, you can list them all by using the 'set' command to list all known in-use shell variables in the current session.

See related links

A shell script starts with the definition of the interpreter to use. Usually when one says ``shell script'', one means bash script. So a good first line would be #!/bin/bash This says that the program located in the filesystem at /bin/bash should be executed with this script as its input. With a bash script, you can simply start typing a list of commands. Furthermore it is possible to use logic and control structures like if, else, for, while, etc etc. See http://tldp.org/HOWTO/Bash-Prog-Intro-HOWTO.html for a good starting guide.

No daemon should ever take that much CPU utilization. That particular daemon will do that if there are some resolution issues. See the related link for details.

The command "man ls" will tell you about the 'ls' command. The last part will be ignored because it isn't part of the manual entry for the 'ls' command.

The command as you can given it is most likely because you want to know what will happen when you issue the 'ls abcdat' command in Linux. The answer is that it will list out the name (in a short form) of the file or directory abcdat if it exists in your current working directory.

I assume you mean the user's ssh directory, which is stored in their home directory. Use the following command:

rm -rf .ssh

This will remove any previously used and verified ssh connections so any connections after that via ssh will need to be verified.

http://support.microsoft.com/kb/923200

When the sending computer sends FIN, the state of the TCP connection is set to FIN_WAIT_2. After the TCP connection has been closed, the sending computer sends RST in order to reset the connection if the receiving computer sends any packets to the sending computer.

C was invented in order to write UNIX. At least some parts of UNIX were written in B (which was repalced by C) but you pretty much have to say UNIX was originally written in C.

~

NEW ANSWER - I didn't feel the need to delete the other answer as it may be true to a point.

Unix was rewritten in C in 1973. This was Unix's fourth Edition. The first edition came out in 1957.

~Andrew York

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The "very" first version of what we know as Unix today was written in 1969 at Bell Labs in, if I recall correctly, Murray Hill, New Jersey. It was written by Ken Thompson, Dennis Ritchie, Brian Kernighan, Joe Ossana and Douglas McIlroy among others.

"Unix" grew out of a previous project known as Multics. The primary goals of the Multics project were sound but it was felt, by some, that it's implementation was flawed in Multics so Bell Labs gradually withdrew from the project and decided to retain the goals of Multics but start essentially from scratch with a new operating system design. Thus was born Unix.

AT&T and Bell Labs also created the 'C' programming language, though you are correct that the earliest incarnations of 'Unix' were not written in what we know as 'C' today. The C programming language was preceded by both the A and B languages, though, if memory serves me correctly, the B language was an interpreter, without compiler output to media.

Unix, and more often Linux today, continues to serve in many roles. Windows NT, Microsoft's second 'Server' operating system, was written and compiled on NEC Unix workstations in the 1990s. Prior to that Microsoft marketed the Xenix operating system as their sole server operating system. Xenix was a 16 bit version of Unix developed by the Santa Cruz Operation (SCO).

Unfortunately, in 1957, hardware architectures were not really capable of running anything that would be recognizable as any form of Unix today. Today, Linux continues to raise the bar with every kernel release and remains the defining standard for Unix like operating systems. Most super computers run Linux today and Linux runs the vast majority of Web sites the world over, along with other excellent Open Source systems such as Apache and Nginx, MySQL and PHP (often referred to as LAMP).

This elaboration upon Unix history would be incomplete (if not fatally flawed) without mention of the creator of Linux, Linus Torvalds. All of us in the IT industry today owe a great debt to Linus Torvalds for his vision and absolute dedication to quality, reliability and security embodied in the Linux kernel as well as the efforts of RMS (Richard M. Stallman) for the work of GNU (Gnu's Not Unix) which, combined with the Linux kernel, comprises in whole or part, nearly every Linux distribution in existance today.

Well known examples of Unix/Linux would include such machines as IBM's Deep Blue Chess computer which beat World Chess Champion Gary Kasparov running IBM's proprietary verson of Unix called AIX and IBM's Watson which defeated two Jeopardy World Champions running SUSE Enterprise Linux version 11. Many well known companies also run Linux such as the Google search engine which operates almost entirely on the Linux operating system.

JMH

Treating devices as files makes it much simpler to perform raw data operations on them. For example, to make a copy of your hard drive, you could simply do

dd if=/dev/hda of=/dev/hdb

And it would make an exact copy of your hard drive onto another disk.

'set' commands vary depending on what shell program you are using. All of them (for each shell) are documented in the 'man' command or 'info' command for that shell. For example, 'man csh', et al.