Destroy a Linux system

7 Deadly Linux commands that can Destroy one System

1. # cd /; rm -rf *

It will Delete Everything
Explanation : It is a combination of three keywords.
First is : rm It will remove all the files followed by this
command.
Second is : -rf This will run rm command in more effective
way and will remove everything ( all files and folders
inside the specified folder )without asking confirmation
from the user.
Third is : / This will start removing the data from the root
directroy and will delete everything from the computer
including the data of removable media.
2. :(){ :|: & };:
Shell function that gets repliacated.
This command creates a shell function , which once get
initialized starts to create multiple copies of itself.It results
in taking quickly all the memory and power of CPU.It
makes computer freeze or not responding. This is also
known as Denial Of Service Attack.
3. # mkfs.ext4 /dev/sda1
This command will format the hard disk
Explanation : This command is again composed of two
keywords.
First is : mkfs.ext4 : This part of command will create a
new ext4 file system on following device where this
command will get executed.
Second is : /dev/sda1 ;This part of command specifies the
1st partition on the first hard disk which is probably in use
by the user.
Similarly, This Command # mkfs.ext3 /dev/sdb2
will Format the second partition on the second hard
disk with ext3 File system.
4.# /dev/sda – Write Any content Directly to a
Hard Drive.
Explanation : This command will execute normally as other
commands in linux do. But output of this command will
directly be sent to the file system (NTFS or FAT ) of the
Hard Drive. It will result into damaging the file system of
the computer.
5. # mv ~ /dev/null
– Beware it Will Move your

Home Directory To Black hole.

Explanation : Moving any of your content and data to
following path : /dev/null means you want to destroy it.
It means /dev/null is a black hole where once anything
sent , can not be recovered back.
Note:Many of these commands will only be dangerous if
they’re prefixed with sudo on Ubuntu – they won’t work
otherwise. On other Linux distributions, most commands
must be run as root user.

7. One more command to spoiled the MBR # dd if=/dev/zero bs=300 count=1 of=/dev/sda

# reboot

8. # cat /bin/date > /bin/mount 

 # reboot