# IO::Tee - phpMan

## NAME
    [IO::Tee] - Multiplex output to multiple output handles

## SYNOPSIS
        use [IO::Tee];

        $tee = [IO::Tee]->new($handle1, $handle2);
        print $tee "foo", "bar";
        my $input = <$tee>;

## DESCRIPTION
    "[IO::Tee]" objects can be used to multiplex input and output in two
    different ways. The first way is to multiplex output to zero or more
    output handles. The "[IO::Tee]" constructor, given a list of output
    handles, returns a tied handle that can be written to. When written to
    (using print or printf), the "[IO::Tee]" object 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 second way is to multiplex input from one input handle to zero or
    more output handles as it is being read. The "[IO::Tee]" constructor,
    given an input handle followed by a list of output handles, returns a
    tied handle that can be read from as well as written to. When written
    to, the "[IO::Tee]" object multiplexes the output to all handles passed to
    the constructor, as described in the previous paragraph. When read from,
    the "[IO::Tee]" object reads from the input handle given as the first
    argument to the "[IO::Tee]" constructor, then writes any data read to the
    output handles given as the remaining arguments to the constructor.

    The "[IO::Tee]" class supports certain "[IO::Handle]" and "[IO::File]" methods
    related to input and 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

    The following methods perform input multiplexing as described above:

    read
    sysread
    readline
    getc
    gets
    eof
    getline
    getlines

    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

    The following methods are directly passed on to the input handle given
    as the first argument to the "[IO::Tee]" constructor:

    input_record_separator
    input_line_number

    Note that the return value of input multiplexing methods (such as
    "print") is always the return value of the input action, not the return
    value of subsequent output actions. In particular, no error is indicated
    by the return value if the input action itself succeeds but subsequent
    output multiplexing fails.

## 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;

        $tee = new [IO::Tee]('</etc/passwd', \*STDOUT);
        my @lines = <$tee>;
        print scalar(@lines);

## REPOSITORY
    <<https://github.com/neilb/IO-Tee>>

## AUTHOR
    Chung-chieh Shan, <ken@digitas.harvard.edu>

    As of August 2017, now being maintained by Neil Bowers.

## COPYRIGHT
    Copyright (c) 1998-2017 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
    perlfunc, [IO::Handle], [IO::File].