$ awk ' function check(num) { return num != 45 ? 1 : 0; } { row = 0; for (i = 1; i <= 9; i++) { row += $i; col[i] += $i; } if (check(row) > 0) { errors[++error_len] = sprintf("error in line %s: %s", FNR, $0); } } END { for (i = 1; i <= 9; i++) { if (check(row) > 0) { errors[++error_len] = sprintf("error in column %s: %s", i, col[i]); } } if (error_len) { for (i = 0; i <= error_len; i++) { print(errors[i]); } } else { print("all good"); } }' sudokuerror in line 4: 6 7 1 4 8 2 6 9 3$ cat sudoku8 1 2 9 7 4 3 6 5 9 3 4 6 5 1 7 8 2 7 6 5 8 2 3 9 4 1 6 7 1 4 8 2 6 9 3 <-- see the 6 here thats an error:2 8 9 3 6 5 4 1 7 6 4 3 7 1 9 2 5 81 9 6 5 3 7 8 2 4 3 2 8 1 4 6 5 7 9 4 5 7 2 9 8 1 3 6
