# print messages to both console and logfile
sub PrintLogCon {
  print @_;
  print(LOG @_) or die "Error printing to $logfile: $!";
  }

##</code><code>##

use warnings;
use strict;
open(LOG, ">$logfile") or die "Error opening $logfile: $!";
...
...
...
do->stuff;
do->it(again) or PrintLogCon("Error: $!");
do->stuff(more);
...
...
...
close LOG or die "Error closing $logfile: $!";
__END__