#!/usr/bin/perl 
use warnings;
use strict;
use LWP::Simple; 

my $file = 'test.txt'; 
my $content = get('http://www. google.com'); 

open FH, " >", "$file" or die "Error: $!\n"; 
print FH $content until -s $file >= 25; 

# I routinely include code to check for a successful closing
# of the filehandle since a hardware error could occur.
close FH or die "Error: $!\n";