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Linux-based operating systems are known for their safety.

But, Damn Vulnerable Linux has instead made efforts to be the most vulnerable versions as possible. This is a Linux distribution, that a five year old can hack holes in.
You can find old chopping-friendly versions of including Apache, MySQL, PHP, FTP, SSH. In addition, you will find all the tools needed to do surgery: gcc, gdb, nasm, strace, and others. Distribution is intended for the use of the curious who want to investigate how interference works, the methods a hacker uses.

Damn Vulnerable Linux should be installed in an isolated virtual environment – to install the operating system on a public computer would be the same as PUDDLE itself in honey and run straight into a swarm of bees.

To downloading it, Click Here

Jaguar, the world’s largest supercomputer, running on Linux Suse operating system, and its not only Jaguar that’s doing that, 6 of 10 of the biggest supercomputer in the world running on Suse Linux Enterprise Server operating system.
According to Top 500 Supercomputer Sites that periodically list the world’s largest supercomputer environments.
The list also tells that nine of the ten of the largest supercomputers use Linux as the operating system.

Jaguar is called the time of writing the largest supercomputer. It is the Department of Energy facility in Oak Ridge, USA. Jaguar was upgraded in 2009. Jaguar is a petascale supercomputer built by Cray at Oak Ridge National Laboratory in Oak Ridge, Tennessee. As of November 2009, it was the world’s fastest computer with a peak performance of more than 1750 teraflops (1.75 petaflops). A Cray XT5 system, Jaguar has 224,256 Opteron processor cores (1 000 000 000 000 000 000 000 000).
Source Wikepedia