To disable the reboot action taken by pressing the Ctrl+Alt+Delete key combination, comment out the following line in the file /etc/init/control-alt-delete.conf.

Type the following command

# sudo vi /etc/init/control-alt-delete.conf

Output

# control-alt-delete - emergency keypress handling
#
# This task is run whenever the Control-Alt-Delete key combination is
# pressed, and performs a safe reboot of the machine.

description     "emergency keypress handling"
author          "Scott James Remnant "

start on control-alt-delete

task
exec shutdown -r now "Control-Alt-Delete pressed"

Change the following line

exec shutdown -r now "Control-Alt-Delete pressed"

To

#exec shutdown -r now "Control-Alt-Delete pressed"

Save and exit the file

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If you want to delete all data contained in your hard drive so that you render it empty in case you want to sell it or for any other reasons, you need to follow these steps:

1. Turn on your computer and boot from Debian Live CD or any of its variants (Debian, Ubuntu, Xubuntu, Edubuntu, Ubuntulite, Fluxbuntu, etc.).
2. In the terminal, run the command given below to disable the swap partition:

sudo swapoff

Note: If you don’t execute this command, some data might remain on your hard drive.

3. Now you have to run the command listed below to zero out your hard drive:

sudo dd if=/dev/zero of=/dev/sda

The formatting process might take a long time to finish, this depends on the size of your hard disk. To view remaining time, you have to run this command:

sudo killall -USR1 dd

Upon running the command listed above, you will be shown the disk space “cleaned” in GB.

The post How To Destroy All Hard Drive Data In Debian appeared first on lifeLinux: Linux Tips, Hacks, Tutorials, Ebooks.