Kali Linux (Backtrack)

Kali Linux is a Debian-derived Linux distribution designed for digital forensics and penetration testing. It is maintained and funded by Offensive Security Ltd. It was developed by Mati Aharoni and Devon Kearns of Offensive Security through the rewrite of BackTrack, their previous forensics Linux distribution.

Kali Linux is preinstalled with numerous penetration-testing programs, including nmap (a port scanner), Wireshark (a packet analyzer), John the Ripper (a password cracker), and Aircrack-ng (a software suite for penetration-testing wireless LANs). Kali Linux can be run from a hard disk, live CD, or live USB. It is a supported platform of the Metasploit Project's Metasploit Framework, a tool for developing and executing security exploits.

Kali Linux is distributed in 32- and 64-bit images for use on hosts based on the x86 instruction set, and as an image for the ARM architecture for use on the Raspberry Pi computer and on Samsung's ARM Chromebook.

>>Source: Wikipedia

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How to change Ubuntu Login Screen

Ubuntu is one of the great OS which comes with handy and flexible features, Unlike windows you can change the login screen very easily in ubuntu(believe me), you don’t need any external softwares or hacks to do it. Even though there is no GUI available presently you can do it through some command lines, So follow me closely and you will be good.


I don't want to be sooo long, so lets get to the procedure

Requirements:
- Ubuntu OS(Lucid), if you don’t have one you can download from here and install it through CD/DVD or install ubuntu through USB flash drive.

- 5 minuets of your valuable time


Step #1: select you favorite wallpaper(.jpeg) and move it to your HOME folder.


Step #2: Open up you terminal through Applications > Accessories > Terminal.


Step #3: Now move it(wallpaper) to the system wallpaper directory by entering this command in terminal
sudo mv ~/your-wallpaper-name.jpg /usr/share/backgrounds

Step #4: After successful completion of moving use this command to activate Appearance window at login.
sudo cp /usr/share/applications/gnome-appearance-properties.desktop /usr/share/gdm/autostart/LoginWindow

Step #5:Now simply close the window and logout of the session, Now at the login screen Appearance tab will be opened, Navigate to backgrounds tab and select your favorite wallpaper, if you can’t find your wallpaper, click ADD. Now you will find the wallpaper in the list(/usr/share/backgrounds directory).



That’s it your login screen will be changed automatically and instantly.


Step #6: For the last step open up the terminal and enter this command to disable the appearance window at every login.

Fedora 17

Fedora formerly Fedora Core, is an RPM-based, general purpose collection of software, including an operating system based on the Linux kernel, developed by the community-supported Fedora Project and sponsored by Red Hat. Fedora’s flexibility makes it capable of serving as a digital repository for a variety of use cases. The Fedora Project's mission is to lead the advancement of free and open source software and content as a collaborative community.

Fedora's Official Website

Fedora 17 arrived on Tuesday following a three-week delay. Nicknamed Beefy Miracle, the Fedora Project promised "over and under-the-bun improvements that show off the power and flexibility of the advancing state of free software".

That's a bold claim for a package with such a ridiculous name. While this is a solid update with significant enhancements under the hood and the latest version of the GNOME desktop, there's nothing particularly miraculous about it - just as we concluded in the review of the beta build.

A miraculous Fedora 17 would have included full support for Btrfs - the kernel at least supports the filing system - but that's going to require a major rewrite of the Anaconda installer interface and has been postponed until at least Fedora 18.

A miraculous Fedora 17 would also have somehow wrangled the full complement of GNOME apps into supporting the new application-level menu in GNOME 3.4. Impossible, you say? Fedora has almost nothing to do with development of GNOME apps? Exactly, but it certainly would have been miraculous if Fedora has done pulled it off nonetheless.

Instead we have a very nice new version of Fedora that, while not miraculous, is well worth grabbing, especially for those of us still trying to adjust to GNOME 3.

GNOME 3.4 continues to polish GNOME 3, particularly the Shell where the search features have improved significantly. Results appear much faster and the Shell is much better at guessing what you want. It does not, however, show results for applications that are in the repos but not yet installed, a nice new feature you'll find in the latest version of Ubuntu's Unity search tool.

GNOME 3.4 also introduces the aforementioned application-level menu that sits in the GNOME Shell bar at the top of the screen and lists actions and options for the program running in the foreground. The application menu pretty much mirrors a very similar feature in Ubuntu's Unity interface, but unfortunately not all applications use the new menu yet, making GNOME 3.4 feel a bit unpredictable and more inconsistent than previous releases.


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MS-Dos vs Linux and Unix

If you are able to navigate using MS-DOS, you should be able to quickly pick up on the navigation of Linux and Unix. In the below chart is a listing of common MS-DOS commands with their Linux and Unix counterpart.

MS-DOS	Linux and Unix
attrib	chmod
backup	tar
dir	ls
cls	clear
copy	cp
del	rm
deltree	rm -R rmdir
edit	vi pico
format	fdformat, mount, and umount
move and rename	mv
type	less <file>
cd	cd chdir
more < file	more file
md	mkdir
win	startx

Linux Ubuntu 11.10(Oneiric Ocelot)

Linux Ubuntu 11.10 (Oneiric Ocelot) is marching ahead. Through our detailed reviews of Alpha 2 and Alpha 3 releases, we followed Ubuntu 11.10 in its each and every developmental phase so far. A lot of things have changed since the third alpha release and as we had promised, here is a preview of latest round of changes in Ubuntu 11.10 and a quick screenshot tour.

>>Go to Official Website

Screenshot of Ubuntu 11.10

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