Linux: Using more than 3 GB of RAM

"Just like Windows, the 32-bit version of Ubuntu Linux has a serious defect: does not support more than 3 GB of RAM. A quantity of memory, while a few years ago could be labeled under the genre Unbelievable (regarding the home PC), today is not difficult to find in many computer geek, all over the world.
That is why urgent to put a "patch" to the problem, then, rimbocchiamoci their sleeves and "armiamoci" terminal because there will be long hours to move seamlessly between commands and incomprehensible decisions that could undermine the stability of the PC. There are cascati? Do not worry, it was only a joke: Use more than 3 GB of RAM is possible in a handful of minutes, following the simple steps below".

Get the external IP of your router on the command line

Sometimes you want to write a script that needs the external IP of the router your client is connected to. Here are three possible solutions.

Avoid allocation of bad ram blocks

"Recently I had problems with a bad ram module. This trick allows you to mark blocks as bad, so they are never used and you dont't have to deposit your memory in the trash, just because a few kb are faulty."

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Hacking the FreeBSD Boot CD

This is a disection of the FreeBSD BootCD. To learn how it all works and how to modify things. The cd that I'm going to be using is 7.0-RELEASE-i386-bootonly.iso
Topics will be:

1)Opening the iso
2)Reading the boot options
3)Working with mfsroot
4)Customize the boot up
5)Burning a new CD to boot from

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Directory indexing

Directory indexing feature improves file access time in large directories or directories containing many files by using hashed binary trees to store the directory information. It is a good way to enable it for example on a web server which has thousands of files in a single directory.

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Change forgotten Windows passwords with Knoppix

I needed access to the XP Recovery Console on a client’s computer. There was a password set for the Administrator account, but they only knew the password to their own. ERD Commander requires the computer successfully booting into Windows after changing (which this computer would not do), Ophcrack said all LM Hashes were empty, and the computer had no floppy drive to use an NT Crack bootable disk. I knew there had to be another way, and I found it with Knoppix and chntpw.

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How to move your MySQL database directory to a second Hard Drive

If you have a dedicated server with a second Hard Drive then you can often achieve better performance (reduce io wait issues) if you move your MySQL databases to the second Hard Drive.

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RarCrack Opens Protected Archives Without Passwords

Open and extract files from ZIP, RAR and 7Zip archives you've forgotten the password to, or never found at the download location, with RarCrack, a free Linux/BSD command line utility.

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How to split .avi files in Windows, OS X or Linux

Using BananaSplitter you can split .avi files (divx or xvid) in Windows (95/98/NT/2000/XP/Vista), Linux/BSD/UNIX or OS X. BananaSplitter works across all these platforms because it’s written in Java, so you will need to have Java installed.

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How to make multiple updates using a single query in MySQL

Nice tutorial.