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Linux deadly commands

Never,and we mean it....
Never run these commands,on your system!
(unless you want to break it!)

rm -rf /

Let's see what it will do:
rm removes data.
-r removes all folders and files recursively
-f forces to delete these files
/ is your whole disk!
so,do not run it!

mkfs.ext3 /dev/hda
this command will format your hard disk in ext3 filesystem,so say goodbye data!

mv / /dev/null
this cool command will move your disk to the "black hole",fairwell!

Wanna have some fun? Wanna know what a Kernel panic is?
Why don't you run some command like this and let Hell break loose?
Seriously,do NOT run any of them!

dd if=/dev/random of=/dev/port

echo 1 > /proc/sys/kernel/panic

cat /dev/port

cat /dev/zero > /dev/mem