perl program.pl "hai hello\nhow r y" "i am fine"

$string1=$Argv[0];
$string1=$Argv[1];
print $string1 ;
print $string2 ;

###output#####
hai hello\nhow r y i am fine

Now------------------------------------------
$string1="hai hello\nhow r y";
$string1="i am fine";
print $string1 ;
print $string2 ;

###output#####
hai hello
how r y i am fine