> こういう事か
> awk '{a="normal"}$1~/^[0-9]+$/{if (!($1%3)){a="aho"}else if($1~/3/){a="aho"}}{print a,"\n"}'

そしてこうか
awk 'BEGIN{for(;;){print int(rand()*100)}}' |\
 awk '{a="normal"}$1~/^[0-9]+$/{if (!($1%3)){a="aho"}else if($1~/3/){a="aho"}}{print $1,a,"\n"}'

参考：2008/08/07(木)11時43分24秒