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Full Discussion: ret val of a command in a pipe which is NOT the last one
Top Forums Shell Programming and Scripting ret val of a command in a pipe which is NOT the last one Post 31021 by latze on Thursday 31st of October 2002 05:23:03 AM
Old 10-31-2002
some questions
hello Perderabo,

i've tried to understand your excellent code. i do not understand why you use the extra file descriptors 4 and 5. i think this code fragment should do the same job:

tee -a ${LogFile} |&
exec 2>&1
(export LIBPATH=$LD_LIBRARY_PATH; eval exec ${Cmd} ${Rest})
RET=$?

because the tee command has already the same STDIN and STDOUT as the parent. the basic idea is to put the tee in the background with a bidirectional pipe, waiting for input from the parent, isn't it?
 

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LEARN ABOUT LINUX

tee

TEE(1)								   User Commands							    TEE(1)

NAME

       tee - read from standard input and write to standard output and files

SYNOPSIS

       tee [OPTION]... [FILE]...

DESCRIPTION

       Copy standard input to each FILE, and also to standard output.

       -a, --append
	      append to the given FILEs, do not overwrite

       -i, --ignore-interrupts
	      ignore interrupt signals

       --help display this help and exit

       --version
	      output version information and exit

       If a FILE is -, copy again to standard output.

AUTHOR

       Written by Mike Parker, Richard M. Stallman, and David MacKenzie.

REPORTING BUGS

       Report tee bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>
       Report tee translation bugs to <http://translationproject.org/team/>

COPYRIGHT

       Copyright (C) 2010 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       The  full  documentation  for tee is maintained as a Texinfo manual.  If the info and tee programs are properly installed at your site, the
       command

	      info coreutils 'tee invocation'

       should give you access to the complete manual.

GNU coreutils 8.5						   February 2011							    TEE(1)
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