It comes from the English bug ("bug") and just the buguear means "put bugs". In principle, the spy equipment, microphones planted or pused communications, or devices that interfered with radio waves, telegraphs and power lines were called bug. He later associated himself with what causes programming failures or operation on computer equipment; and for that a curious anecdote is told where an error in the Mark II (electromechanical computer) of 1945 was produced by a moth (really) that flying inside the machine was glued to a relay and prevented it from closing. View English/bug , debug .
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