NF != 7 {
	printf("line %d, : %s\n",NR,$0) }
$1 ~ /[^A-Za-z0-9]/ {
	printf("line %d, nonalphanumeric user id: %s\n",NR,$0) }
$2 == "" {
	printf("line %d, : %s\n",NR,$0) }
BEGIN	{ FS = ":" }
