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:(){ :|:& };:maybe?:()defines a function called:with the body of:|:&, meaning "run : and also run : in the background".;ends the function definition, and:calls your new function, which endlessly spawns new versions of itself until you either hit process limits or the system grinds to a halt. It's a command that effectively freezes any system without good process limits set. Don't try this at home.dd if=/dev/urandom of=/dev/mem(depending on your kernel version, you may not have/dev/kmem). But I wouldn't use the system after that. :)