#!/usr/local/bin/perl -w 

use strict;
use IO::File;

#Open and read In File

open(IN, '/myfiles/test/file')||die "Can not open '/myfiles/test/file' :$!\n"
while(<IN>){
};
close (IN);

#Open file for writing

open(OUT, '>', $file)||die "Can not open $file :$!\n";
print OUT "...800Lines of output...";
close(OUT);