Linux Operating System - Debian, Ubuntu, Fedora, Gentoo, Arch

I have been buying some music on itunes, it comes in AAC (.m4a) format, which is great to use in itunes (I have it on a Windows 7 running over VirtualBox), or to use it in my iPod Touch or iPod shuffle, but if I want to use it in my cell phone (an old one which does not support AAC format) I have to convert it to mp3, I have to also convert it if I plan to use mpg123 which I use a lot.

Well lets go to learn how to convert from AAC to MP3

While Trying to install VirtualBox from AUR, and when installing the dependencies, I got this error.

==> Starting build()...
/tmp/yaourt-tmp-keripix/aur-libpng12/libpng12/./PKGBUILD: line 26: patch: command not found
==> ERROR: Build Failed.
Aborting...
Error: Makepkg was unable to build libpng12 package.

It was solved by install base-devel package

It may happen that you have send a real big job to the printer, and then you realize that, you forgot to change the paper size from A4 to letter, or any other scenario where you may need to change something in a document already sent to the printer queue, so now you need to cancel it.

Iptables, is a great tool to create firewall in Linux, actually it is not only for that, but useful to pre-process or post-process any package of data that arrives to our Linux Operating System machine.

The other day I was needing to block the access to my network using the mac address of a machine, and Iptables come to save my day.

This is my scenario, I have an open Access Point (Do not never do that, always keep your access points closed, using WEP or better WPA, or mac address filtering).

I have just wrote a post about how to install nslookup, but what is nslooup?

well, according to wikipedia it is

"nslookup is a computer program used in Windows and Unix to query Domain Name System (DNS) servers to find DNS details, including IP addresses of a particular computer, MX records for a domain and the NS servers of a domain. The name nslookup means "name server lookup". The most common version of the program is included as part of the BIND package. More modern alternatives to nslookup are the "host" and "dig" programs which also ship with BIND. Both nslookup and dig look up nameserver information from /etc/resolv.conf."

If you work with Ubuntu, Debian or Fedora, as soon as you have your default installation, you will probable have nslookup utility installed, but, if you are like me, working on Arch Linux, you will have to install it.

Just enter this.

sudo pacman -S dnsutils

And you will nslookup and other dns utilities ready to run.

Everytime I upgrade my kernel on Arch Linux, VirtualBox stops working, and everytime, I can't remember the command to rebuild it.

So I am copying here how to do it, so I can come and read it.

---------------------------------------------------------------------------
 IMPORTANT NOTES:

- Run "vbox_build_module" as root every time your kernel is upgraded, to

If you have installed Picard in Arch Linux, and you try to explore the CD "CD Lookup", you may get an error like this:

Error While reading CD

Error opening library: libdiscid.so.0 cannot open shared object file: No such file or directory

That is because, you may have not installed libdiscid.so.O, so go ahead and install it from yaour.

yaourt libdisc