How to Change Grub2 Default Timeout in Ubuntu / Debian Linux

To make any changes in GRUB 2  you need to edit the main GRUB 2 configuration file  located in /etc/default/ folder, you can edit it by running the following command from terminal:
sudo gedit /etc/default/grub you can see the contents like


# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
#   info -f grub -n 'Simple configuration'

GRUB_DEFAULT=0
#GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""

To change the default timeout option in GRUB 2, just  change the GRUB_TIMEOUT parameter.

The value of this parameter is in sec, change this value as per your requirement.

How to Find MAC Address in Ubuntu / Debian Linux

MAC address is the unique serial number of your Network Card. It is SIX TWO-Digit HEX Numbers Separated by Column(:). By using MAC number You can Identify your Network Card Manufacturer. By using the simple command ifconfig you can find your MAC Address. 

Open a terminal and type ifconfig , you will get a text output. In the  first line you can see like HWaddr: 00:BA:13:67:78:76.

Gimp Command Reference ( keyboard Shortcuts) for Ubuntu / Debian Linux

GIMP (GNU Image Manipulation Program) is a free image editing and manipulation tool editor which is often tagged as a free Photoshop alternative. It can handle essential image editing tasks like image resizing, editing, cropping, photomontages, and converting images between different image file formats. GIMP is freely available for most popular operating systems including Microsoft Windows, Apple Mac OS X, and Linux. Also with this free cheat sheet you will receive daily updates on new cool websites and programs in your email for free, courtesy of MakeUseOf. Click Here

Raspberry pi Trouble Shooting: RED Power LED is Blinking

 Raspberry pi Trouble Shooting: RED Power LED is Blinking

The Red Power LED is directly connected to 3.3V Power supply rail od Raspberry Pi. So it should never Blink. If it is blinking , it means the 5V is dropping out. So change the power supply.

Solution: Change Power Supply with rating 5V,1A (5V, 700ma As per specs)

Check the voltage between Tp1  and Tp2 ( Two points you can see in the board component side.

How to set Password in Raspberry Pi (Raspbian)

The Default Password of  Raspberry Pi image of Debian Squeeze, Wheezy is
        
           username: pi
           password: raspberry 

Now How to Change your password :

Type 

pi@raspberrypi: ~$ passwd

(current) UNIX password: raspberry   # default (Current) Password

Enter new UNIX password: newpassword   # Your New Password Type here

Retype new UNIX password: newpasssword   #Repeat Your New Password.