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Full Discussion: tcsh - understanding difference between "echo string" and "echo string > /dev/stdout"
Top Forums Shell Programming and Scripting tcsh - understanding difference between "echo string" and "echo string > /dev/stdout" Post 302668597 by marcink on Monday 9th of July 2012 03:01:53 PM
Old 07-09-2012
Quote:
Originally Posted by shamrock
The first line "Redirected to STDOUT" which you expect to show up in the file mystdout got overwritten by the last one "Should default to STDOUT without redirection"...and this will happen with any sh not just the tcsh...and by appending to mystdout you will see both the lines there...
Code:
./out_to_streams.csh >> mystdout

Tried it and I get the same result. I've tried "append redirect" (i.e. ">>") on the command line as suggested, and it did not work. I changed it in the script as well:
Code:
#!/bin/tcsh -f

echo Redirected to STDOUT >> /dev/stdout
echo Redirected to STDERR >> /dev/stderr

echo Should default to STDOUT without redirection

And "Redirect to STDOUT" still gets lost. I've tried all four combinations (i.e. ">" vs ">>" in script and on command line), and in all cases "Redirect to STDOUT" gets lost.

Is there some bizarre handling of the IO streams and redirects in tcsh that can explain this behavior?
 

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LEARN ABOUT OSX

test::output::tie

Test::Output::Tie(3)					User Contributed Perl Documentation				      Test::Output::Tie(3)

NAME

       Test::Output::Tie - module used by Test::Output to tie STDERR and STDOUT

DESCRIPTION

       You are probably more interested in reading Test::Output.

       This module is used to tie STDOUT and STDERR in Test::Output.

   Methods
       TIEHANDLE
	   The constructor for the class.

       PRINT
	   This method is called each time STDERR or STDOUT are printed to.

       PRINTF
	   This method is called each time STDERR or STDOUT are printed to with "printf".

       FILENO
       BINMODE
       read
	   This function is used to return all output printed to STDOUT or STDERR.

AUTHOR

       Currently maintained by brian d foy, "bdfoy@cpan.org".

       Shawn Sorichetti, "<ssoriche@cpan.org>"

SOURCE AVAILABILITY

       This module is in Github:

	       http://github.com/briandfoy/test-output/tree/master

COPYRIGHT &; LICENSE
       Currently maintained by brian d foy, "bdfoy@cpan.org".

       Copyright 2005-2008 Shawn Sorichetti, All Rights Reserved.

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

ACKNOWLEDGMENTS

       This code was taken from Test::Simple's TieOut.pm maintained Michael G Schwern. TieOut.pm was originally written by chromatic.

       Thanks for the idea and use of the code.

perl v5.16.2							    2011-04-21						      Test::Output::Tie(3)
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