if看你再混

#!/usr/bin/lua
a=1
if a==1 then
    print ("a is one")
end

#!/usr/bin/perl
$count=1;
if($count == 1){
        print("=");
}else{
        print("not =");

}

#!/bin/sh
if [ -z "$1" ];then
        echo "no parameter";
else
        echo $1;
fi