Duplicate output without tee

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io::tee

Tee(3pm)						User Contributed Perl Documentation						  Tee(3pm)

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), "
";

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

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

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

       perlfunc, IO::Handle, IO::File.

perl v5.12.3							    2001-03-10								  Tee(3pm)

Shell Programming and Scripting