Taking a look at variable scope, pipes and while-loops in various Linux and Unix shells.

«One year after the release of Debian GNU/Linux 5.0 alias "lenny" and nearly three years after the release of Debian GNU/Linux 4.0 alias "etch" the security support for the old distribution (4.0 alias "etch") is coming to an end next month. The Debian project is proud to be able to support its old distribution for such a long time and even for one year after a new version has been released...»

A beautifully constructed timeline of Unix which includes modern day Unix descendants such as Solaris and Mac OSX as well as Linux. This timeline is not very much unlike the mind map of Linux I had created a long time back. But this timeline also provides the year when the Unix/Linux flavor was born.

“Twenty-five years ago on September 27, 1983, I announced a plan to create a completely free operating system called GNU — for ‘GNU is not Unix’. As part of the 25th anniversary of the GNU system, I have written this article on how our community can avoid ruinous compromises. In addition to avoiding such compromises"

We are very familiar with Linux and its relation with UNIX.But most us of dont actually know what are differnces between the two.
Linux is called Unix-like and is not a true Unix operating system.

You almost certainly have speed dial set up on your home, office and mobile phone. It saves time, ensures against a failing memory and allows you to work smarter.

Part four of a five part post series on setting up Linux and Unix servers securely.

Part three of a five part post series on setting up Linux and Unix servers securely.

Whenever people thinks of a free operating system (if they do), the odds are that they will think of Linux, a clone of UNIX from 1991. They also might think of one or more of the BSDs, UNIX-derivatives dating back to the early ’80s. Let’s face it, though—UNIX is pretty boring. It was great for a PDP-11, and it gets the job done now, but it’s not exactly exciting.