NAME

IO::Tee - Multiplex output to multiple output handles

SYNOPSIS

use IO::Tee;

        $tee = IO::Tee->new($handle1, $handle2);
        print $tee "foo", "bar";

DESCRIPTION

The `IO::Tee' constructor, given a list of output handles, returns a tied handle that can be written to but not read from. When written to (using print or printf), it multiplexes the output to the list of handles originally passed to the constructor. As a shortcut, you can also directly pass a string or an array reference to the constructor, in which case `IO::File::new' is called for you with the specified argument or arguments.

The `IO::Tee' class supports certain `IO::Handle' and `IO::File' methods related to output. In particular, the following methods will iterate themselves over all handles associated with the `IO::Tee' object, and return TRUE indicating success if and only if all associated handles returned TRUE indicating success:

close
truncate
write
syswrite
format_write
formline
fcntl
ioctl
flush
clearerr
seek
Additionally, the following methods can be used to set (but not retrieve) the current values of output-related state variables on all associated handles:

autoflush
output_field_separator
output_record_separator
format_page_number
format_lines_per_page
format_lines_left
format_name
format_top_name
format_line_break_characters
format_formfeed
EXAMPLE

        use IO::Tee;
        use IO::File;

        my $tee = new IO::Tee(\*STDOUT,
            new IO::File(">tt1.out"), ">tt2.out");

        print join(' ', $tee->handles), "\n";

        for (1..10) { print $tee $_, "\n" }
        for (1..10) { $tee->print($_, "\n") }
        $tee->flush;

AUTHOR

Chung-chieh Shan, ken@digitas.harvard.edu

COPYRIGHT

Copyright (c) 1998-2001 Chung-chieh Shan. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

SEE ALSO

the perlfunc manpage, the IO::Handle manpage, the IO::File manpage.