If you only need the min and the max, then you don't need to store your numbers and an array and then sort the array: just maintain a $min and $max variables as you read the file. Possibly something like this:

my ($min, $max) = (0, 0);
while(<>){

chomp($input=$_);

if($input ne ''){
     $min = $input if $input < $min;
     $max = $input if $input > $max;
}
else{last;}
}
print "Min and Max are : $min $max \n";
[download]

EDIT: fixed a typo on the $max variable name.

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