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Reference on LINUX
1) Record your terminal with Script The script command is part of the util-linux-ng package and so should be available already installed in any distribution, or you should be able to easily add it. What’s script ? From his man page: Script makes a typescript of everything printed on your terminal. It is useful for students who need a hardcopy record of an interactive session as proof of an assignment, as the type script file can be printed out later with lpr. 2) SysRQ in Linux Sometimes happen that your desktop freeze and you cannot do anything, so the only choice is to unplug the power cord ? No, Linux has the magic SysRq key that can sync your disk and issue a reboot of your system…and many more things. What is the magic SysRq key? It is a ‘magical’ key combo you can hit which the kernel will respond to regardless of whatever else it is doing, unless it is completely locked up. 3) 35 Great Open Web Games Game On 2010 is Mozilla Labs‘ first international gaming competition. Game On is all about games built, delivered and played on the open Web and the browser. Now we are at the final phase and there are 35 great games fighting to get the first prize. You can still cast your vote and get a chance to win a prize from the mozilla foundation 4) Bash as CGI Sometimes it can be useful with a simple CGI to show the contents of a directory, or run a command with some parameters. If you are a programmer you probably will think at a elegant and practical solutions in Java, Ruby or PHP, but for a system administrator may be convenient to make a simple bash program, a language he’s using everyday. Let’s see how to use the bash we use usually on the terminal in a CGI program
======================================================================================== ============================= Info on ZFS filesystem (128 bit) ================================== ========================================================================================
Hey guys.
I just wanted to bring this up as a topic to consider. I have been reading up lately on quantum physics (out of fascination) and this came up.
If you would rather just read the article and make sense of it yourself then heres the link: en.wikipedia.org/wiki/ZFS
Now im sure all of you who have worked with servers are familiar with the ZFS file system. If not then this is a 128bit file system (as per the title) that is able to hold riddiculously large amounts of data. The maximum size of a ZFS file system is 256ZB.
1ZB = 100,000,000,000,000,0GB or = 100,000,000,000,0TB or = 100,000,000,0PB or = 100,000,0EB
So as you can see. Thats a fair bit of data (mioreng, you could still index the internet yet :P)
I have included a long story for those more technically minded and a short and simple version for those who arent up to scratch of computer physics.
Short version: Because of the the laws of physics, There is not actually enough energy to realisitically save this amount of data. Refering to the top title it would require more energy to write that amount of data than it would to boil all of the oceans (assuming they are all at 0c) to 100c.
Long Version: Quoted from the most relevant part of the article.
Although we'd all like Moore's Law to continue forever, quantum mechanics imposes some fundamental limits on the computation rate and information capacity of any physical device. In particular, it has been shown that 1 kilogram of matter confined to 1 liter of space can perform at most 1051 operations per second on at most 1031 bits of information. A fully populated 128-bit storage pool would contain 2128 blocks = 2137 bytes = 2140 bits; therefore the minimum mass required to hold the bits would be (2140 bits) / (1031 bits/kg) = 136 billion kg.
To operate at the 1031 bits/kg limit, however, the entire mass of the computer must be in the form of pure energy. By E=mc², the rest energy of 136 billion kg is 1.2x1028 J. The mass of the oceans is about 1.4x1021 kg. It takes about 4,000 J to raise the temperature of 1 kg of water by 1 degree Celsius, and thus about 400,000 J to heat 1 kg of water from freezing to boiling. The latent heat of vaporization adds another 2 million J/kg. Thus the energy required to boil the oceans is about 2.4x106 J/kg * 1.4x1021 kg = 3.4x1027 J. Thus, fully populating a 128-bit storage pool would, literally, require more energy than boiling the oceans.[10]
The thing about this is that means theres is only a certain amount of data can be held on earth. I mean obviously it will be many years before this is an issue but still.
