shell kill machine

[Jan ' Kozo ' Vajda]

mohol by  mi niekto, kto je zbehly v shell programingu vysvetlit, preco mi
nasledujuca postupnost znakov

:(){ :|:&};:

napisana z cmd-line bash zatuhne masinu ? 

predpokladam, ze to je nejaky vycurany vyraz, ale nejako som ho nepochopil
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