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Full Discussion: How Unix tee to send pipeline output to 2 pipes ?
Top Forums Shell Programming and Scripting How Unix tee to send pipeline output to 2 pipes ? Post 302298097 by drl on Monday 16th of March 2009 05:13:51 PM
Old 03-16-2009
Hi.

Here is an example using things you mentioned:
Code:
#!/usr/bin/env bash

# @(#) s1       Demonstrate bash connecting output to processes.

echo
set +o nounset
LC_ALL=C ; LANG=C ; export LC_ALL LANG
echo "Environment: LC_ALL = $LC_ALL, LANG = $LANG"
echo "(Versions displayed with local utility \"version\")"
version >/dev/null 2>&1 && version "=o" $(_eat $0 $1) tee
set -o nounset
echo

FILE=${1-data1}

echo " Data file $FILE:"
cat $FILE

# Remove files from previous runs.

rm -f vowels four

echo
echo " Results:"
cat $FILE |
tee >( grep '^[aeiouy]' > vowels ) >( grep '^....$' > four )

sleep 1
echo
echo " Auxiliary files created:"
wc -l vowels four

exit 0

Producing:
Code:
% ./s1

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 2.6.11-x1, i686
Distribution        : Xandros Desktop 3.0.3 Business
GNU bash 2.05b.0
tee (coreutils) 5.2.1

 Data file data1:
red
orange
yellow
green
blue
indigo
violet

 Results:
red
orange
yellow
green
blue
indigo
violet

 Auxiliary files created:
 3 vowels
 1 four
 4 total

The main data file is run through tee, the output of which bash connects to a few grep processes. The count at the end verifies the grep - one looks for lines beginning with a vowel, the other looks for lines that have 4 characters total. You can replace the wc to look at the content rather than simply counting.

The sleep is there because the processes that tee was writing to were not quite finished. The first few times I ran it there were no data in the files.

See man pages for details ... cheers, drl
 

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LEARN ABOUT DEBIAN

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) 2011 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 8.12.197-032bb					  September 2011							    TEE(1)
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