We have already learned how to convert jpeg files to pdf on Linux. Now I am going to show you how you can convert .3ga or .3gp audio files to mp3 or ogg. Of course I use Ubuntu.

If you type in Google that "3gp to mp3 linux" thing, you found the ffmpeg command. That's OK. But somehow I cannot make this ffmpeg wokr on my Ubuntu. So I found another way to converting 3gp to mp3.

Gnac

is an audio file converter application. You can install with

I bought SSD drive to my laptop, so I decided to minimize write I/O on my system. The less writing is a good idea even you have a HDD. Your system become faster in this way.

There are some good starting point:

I need a method I can make a backup from my laptop. I used a USB HDD for that and linux prompt.

1. step: Make an initial copy of your data

So, after i mount my USB HDD I used first time the cp command of course.

I had a real Linux server system that I need to convert into virtual server, because I wanted to sell my old hardware, but I needed the system as backup. This backup is able to run as virtual server. This is a very useful backup method. This tutorial show you how you can convert your whole system into virtualbox system. Virtualbox is a free opensource virtual computer solution from Oracle.

1. Backup your system disk

If you can, put your system disk to another computer. But if you can't do it you can do it the original system.

This code cause logout feeling for your user. The browser will ask again the username and password.

<?php
  header('WWW-Authenticate: Basic realm="protected area"');
  header('HTTP/1.0 401 Unauthorized');
?>

I use it with a logout controller, that set a session variable to true and redirect the request to the home page. And the home page check this session variable, and if it true, it sends these headers and set back the session variable to null.

Check active scsi devices:

ubuntu@ubuntu:~$ lsscsi
[1:0:1:0]    disk    ATA      SAMSUNG HD103SJ  1AJ1  /dev/sda 
[2:0:0:0]    disk    ATA      SAMSUNG HD103SJ  1AJ1  /dev/sdb 
[3:0:0:0]    cd/dvd  HL-DT-ST DVDRAM GH22NS90  HN00  /dev/sr0 
[5:0:0:0]    disk    Generic  STORAGE DEVICE   9451  /dev/sdd 
[6:0:0:0]    disk    GT-I5700  - Card                /dev/sdc 

Now refresh SCSI devices. Use this command to refresh host0 (or host1, host2, host3):

ubuntu@ubuntu:~$ echo "- - -" | sudo tee -a /sys/class/scsi_host/host0/scan 

Check the result:

My goal:
I want to see the intranet website from home with my linux laptop. I can connect over SSH to the intranet web server. But I want to see the webpage in a browser of my laptop.

The solution is SSH port forwarding. From my Linux laptop. Here is the syntax:

ssh -L <myPortNumber>:<RemoteIP>:<RemotePort>  <host> [other ssh options like port and user]

I used this:

ssh -L 8088:127.0.0.1:80  intranetserver.example.com

Now I can click to http://localhost:8088/ on my favorite browser and I can browse the intranet.

New ASUS K55 Laptop with UEFI Bios

I have a client who bought an ASUS K55VD laptop. This laptop is coming with Windows 8. But my client had bought a windows 7. So He wanted to use this windows 7 on his new laptop. I had another task. I had to change the HDD to SSD. It sounds easy, doesn't it?

Problems was coming...

I have never seen UEFI BIOS before. I did not think this will be a challenge for me. I tell the truth I wasted a lot of time to install the OS.

Here is my favorite tool: . This is fast and really easy to use . There are some alias for it: , resize-links.com, , etc. All of these are the same link shortener tool. No advertisement all. There is the fastest redirection that I have ever seen. Try it and use it.