Linux commands that you should never run on your Linux system.

Bash fork bomb. This will lock up your computer and cause all sorts of problems. Do not run this.

:(){ :|:& };:

The bash fork bomb is an obfuscated version of this code. This will fork() over and over again until the computer locks up.

fork()
{
    fork | fork &
}

Here is another version of this code.

:(){ :&:& };:

Do not run this! The command below is another one that you should not run. This will erase all files on a Linux system.

sudo rm -rf --no-preserve-root /

Here is another nasty command to not run on your system. This one will progressively overwrite your Linux partition with random noise.

sudo cat /dev/urandom > /dev/sda1