http://www.perlmonks.org?node_id=214219
Description: This module encapsulates any number of filehandles in a kind of "meta-filehandle". Any operations you perform on the meta-filehandle are delegated to all of the contained handles. This may be similar to the IO::Tee module.

This solution was developed in response to Printing to multiple file handles with one request.

Updated in response to helpful comments from jmcnamara and Aristotle.


=head1 NAME

IO::MultiHandle - Encapsulate multiple handles in one.

=head1 SYNOPSIS

    use IO::MultiHandle;

    my $logfh = IO::File->new( "> $outfile" ) or die "write $outfile: 
+$!";

    # create a multi-handle which will write to both
    # STDERR and the filehandle created above:
    my $mfh = new IO::MultiHandle *STDERR, $logfh;

    print $mfh "A line of output.\n";

=cut


package Tie::MultiHandle; # do not use directly.
  use IO::Handle;

  sub TIEHANDLE
  {
    my $pkg = shift;
    bless [ @_ ], $pkg
  }

  sub AUTOLOAD
  {
    my( $self, @args ) = @_;
    our( $AUTOLOAD );
    $AUTOLOAD =~ s/.*::(.*)/\L$1/;
    for my $fh ( @$self ) { $fh->$AUTOLOAD( @args ); }
  }

  sub DESTROY
  {
  }


package IO::MultiHandle;
  use Symbol;

  # takes a list of handles
  sub new
  {
    my $pkg = shift;
    my $self = gensym;
    tie *$self, Tie::MultiHandle::, @_;
    bless $self, $pkg
  }