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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 302298107 by jack2 on Monday 16th of March 2009 05:43:38 PM
Old 03-16-2009
Quote:
Originally Posted by drl
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
thanks, really excellent solution and it really works
now I have to replace data files by data streams (virtual devices or alike)
and build pipelines.
I don't know how to create output pipeline.
Redirecting file output >> to append to a file I risk generating oversized file.
So it should work as output device , like monitor, line printer, serial device
or TCP/IP port
Does shell support direct writing to a TCP/IP port or serial, virtual port, created and defined by shell self ?

Jack
 

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LEARN ABOUT CENTOS

gldeleteprogrampipelines

GLDELETEPROGRAMPIPEL(3G)					   OpenGL Manual					  GLDELETEPROGRAMPIPEL(3G)

NAME

       glDeleteProgramPipelines - delete program pipeline objects

C SPECIFICATION

       void glDeleteProgramPipelines(GLsizei n, const GLuint *pipelines);

PARAMETERS

       n
	   Specifies the number of program pipeline objects to delete.

       pipelines
	   Specifies an array of names of program pipeline objects to delete.

DESCRIPTION

       glDeleteProgramPipelines deletes the n program pipeline objects whose names are stored in the array pipelines. Unused names in pipelines
       are ignored, as is the name zero. After a program pipeline object is deleted, its name is again unused and it has no contents. If program
       pipeline object that is currently bound is deleted, the binding for that object reverts to zero and no program pipeline object becomes
       current.

ASSOCIATED GETS

       glGet() with argument GL_PROGRAM_PIPELINE_BINDING

SEE ALSO

       glGenProgramPipelines(), glBindProgramPipeline(), glIsProgramPipeline(), glUseShaderPrograms(), glUseProgram()

COPYRIGHT

       Copyright (C) 2010 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication
       License, v 1.0, 8 June 1999.  http://opencontent.org/openpub/.

AUTHORS

       opengl.org

opengl.org							    06/10/2014						  GLDELETEPROGRAMPIPEL(3G)
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