5 Deadly linux commands that can Destroy one System



1. Command > 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  directory  and will delete everything from the computer including the data of removable media.
2. Command > :(){ :|: & };:                   = Shell function that gets replicated.

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. Command > 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. Command > /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. Command > 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.

Comments

Post a Comment

Popular posts from this blog

What is the purpose of jam signal in CSMA/CD?

First, beware that modern switched Ethernet LANs are not CSMA/CD anymore. CSMA/CD was a technique that applied to 10mbit/sec and 100mbit/sec Ethernets that used hubs, not switches. And honestly there were never many 100BASE-TX hubs around; everyone went to switches around that time. The Gigabit Ethernet (1000BASE-T) spec requires switches; there's no such thing as a GigE hub. On modern switched Ethernets, you don't have a shared medium anymore. When you're plugged into a switch, the "collision domain" is only between you and your switch port. And if you're in full duplex mode, which is almost always true with switches, then you don't have any possibility of collision at all. If you can't have a collision, you'll never detect a collision, so you'll never have reason to transmit a jam signal. So back in the days of hubs (and shared cables like thinnet/cheapernet/10BASE-2 coax and thicknet 10BASE-5), here's how it worked: Imagine you h
Read more

Difference Between EEPROM and Flash

EEPROM vs Flash Flash is a very popular term when it comes to storage media as it is used by portable devices like phones, tablets, and media players. Flash actually is an offspring of EEPROM, which stands for Electrically Erasable Programmable Read-Only Memory. The main difference between EEPROM and Flash is the type of logic gates that they use. While EEPROM uses the faster NOR (a combination of Not and OR), Flash uses the slower NAND (Not and AND) type. The NOR type is a lot faster than the NAND type but there is the matter of affordability as the former is significantly more expensive than the NAND type. Another advantage of EEPROM over Flash is in how you can access and erase the stored data. EEPROM can access and erase the data byte-wise or a byte at a time. In comparison, Flash can only do so block-wise. In order to simplify the whole thing, individual bytes are grouped into a smaller number of blocks, which can have thousands of bytes in each block. This is a bit problema
Read more