weichenxiehou

用gawk来应该还是比较方便：

BEGIN{FS="/";printf "input:"}	
{
	ok=0
	if($1 !~ /[0-9]+/ || $2 !~ /[0-9]+/)
		{print "illegal input!";printf "input:";next}
	for(i=($1<$2?$1:$2);i>1;i--)
		if($1%i==0 && $2%i==0)
			{ok=1;printf("result:%d/%d\n",$1/i,$2/i);break}
	if(ok==0) printf("result:%d/%d\n",$1,$2)
	printf "input:"
}
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