Deadly Commands in Linux

Here are the few of the deadly commands which must never be executed in Linux/Unix machines.

1. rm -rf / 
    This will delete everything it can possibly, including files on the hard drive and storage    connected to the devices.

2.  :(){ :|: & };: 

    The above bash function is called as fork bomb.

    This process continually replicates itself, and its copies continually replicate themselves, quickly taking up all your CPU time and memory. This can cause your computer to freeze. It's basically a denial-of-service attack.

3. mkfs.ext3/[ext4] /dev/sda1 

    Formats your Hard Drive

4. >/dev/sda

    This will write data to hard drive damaging hard drive

5.dd if=/dev/random of=/dev/sda
   This will write junk into your hard drive.

6. mv ~ /dev/null

   Your home directory contents will be destroyed.