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$ perl -le " printf qq{v%vd\n}, join q//, map {chr $_} 1000, 44000, 99 +000 , 12 " v1000.44000.99000.12 ... $ perl -le " print q{bits are }, join q{-}, unpack q{(B8)*}, q{123} " bits are 00110001-00110010-00110011