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Man Pages


Manual Reference Pages  -  PERLIO::TEE (3)

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NAME

PerlIO::tee - Multiplex output layer

CONTENTS

SYNOPSIS



        open my $out, >>:tee, $file, @sources;

        $out->push_layer(tee => $file);
        $out->push_layer(tee => ">> $file");
        $out->push_layer(tee => \$scalar);
        $out->push_layer(tee => \*FILEHANDLE);



DESCRIPTION

PerlIO::tee provides a multiplex output stream like tee(1). It makes a filehandle write to one or more files (or scalars via the :scalar layer) at the same time.

You can use push_layer() (defined in PerlIO::Util) to add a source to a filehandle. The source may be a file name, a scalar reference, or a filehandle. For example:



        $fh->push_layer(tee => $file);    # meaning "> $file"
        $fh->push_layer(tee => ">>$file");# append mode
        $fh->push_layer(tee => \$scalar); # via :scalar
        $fh->push_layer(tee => \*OUT);    # shallow copy, not duplication



You can also use open() with multiple arguments. However, it is just a syntax sugar to call push_layer(): One :tee layer has a single extra output stream, so arguments $x, $y, $z of open(), for example, prepares a filehandle with one default layer and two :tee layers with a internal output stream.



        open my $tee, >:tee, $x, $y, $z;
        # the code above means:
        #   open my $tee, >, $x;
        #   $tee->push_layer(tee => $y);
        #   $tee->push_layer(tee => $z);

        $tee->get_layers(); # => "perlio", "tee($y)", "tee($z)"

        $tee->pop_layer();  # "tee($z)" is popped
        $tee->pop_layer();  # "tee($y)" is popped
        # now $tee is a filehandle only to $x



EXAMPLE

Here is a minimal implementation of tee(1).



        #!/usr/bin/perl -w
        # Usage: $0 files...
        use strict;
        use PerlIO::Util;

        *STDOUT->push_layer(tee => $_) for @ARGV;

        while(read STDIN, $_, 2**12){
                print;
        }
        __END__



SEE ALSO

PerlIO::Util.

AUTHOR

Goro Fuji (X XX) <gfuji (at) cpan.org>

LICENSE AND COPYRIGHT

Copyright (c) 2008, Goro Fuji <gfuji (at) cpan.org>. Some rights reserved.

This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

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perl v5.20.3 PERLIO::TEE (3) 2011-05-25

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