1*9a7741deSElliott Hughes{ x[$1] = $1 2*9a7741deSElliott Hughes delete x[$1] 3*9a7741deSElliott Hughes n = 0 4*9a7741deSElliott Hughes for (i in x) n++ 5*9a7741deSElliott Hughes if (n != 0) 6*9a7741deSElliott Hughes print "error", n, "at", NR 7*9a7741deSElliott Hughes} 8