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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 302297433 by jack2 on Friday 13th of March 2009 10:58:07 AM
Old 03-13-2009
How Unix tee to send pipeline output to 2 pipes ?
Hi,

I would like to process, filter the same ASCII asynchronous live data stream in more than one pipe pipeline.

So the one pipeline should filter out some records using grep key word
and more than one pipes pipelines
each should grep for another key words, each set seperately for each pipe.

There is a number of good examples from the net, how to output pipe result to terminal as well as to save to a file,
but I need to process the same live data stream by a number of pipes pipelines in parallel and output the results to seperate files on-the-fly.

It would work as fork.
How can I define a numer of parallel processes, reading the same
data stream in parallel , as in the example below ?

Jack

--------

Since tee can read the standard input, and write to multiple files, we may leverage this feature so that it writes to multiple processes (instead of files).
tee >(process1) >(process2) >(process3) | process4

Here's a simple example of how to do this. Run the following command to get a directory listing on your terminal, while also redirecting the output to a file named poop.out:
ls -al | tee poop.out

echo “hello world” | tee test.txt
 

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LEARN ABOUT DEBIAN

gluseprogramstages

GLUSEPROGRAMSTAGES(3G)						  [FIXME: manual]					    GLUSEPROGRAMSTAGES(3G)

NAME

       glUseProgramStages - bind stages of a program object to a program pipeline

C SPECIFICATION

       void glUseProgramStages(GLuint pipeline, GLbitfield stages, GLuint program);

PARAMETERS

       pipeline
	   Specifies the program pipeline object to which to bind stages from program.

       stages
	   Specifies a set of program stages to bind to the program pipeline object.

       program
	   Specifies the program object containing the shader executables to use in pipeline.

DESCRIPTION

       glUseProgramStages binds executables from a program object associated with a specified set of shader stages to the program pipeline object
       given by pipeline.  pipeline specifies the program pipeline object to which to bind the executables.  stages contains a logical combination
       of bits indicating the shader stages to use within program with the program pipeline object pipeline.  stages must be a logical combination
       of GL_VERTEX_SHADER_BIT, GL_TESS_CONTROL_SHADER_BIT, GL_TESS_EVALUATION_SHADER_BIT, GL_GEOMETRY_SHADER_BIT, and GL_FRAGMENT_SHADER_BIT.
       Additionally, the special value GL_ALL_SHADER_BITS may be specified to indicate that all executables contained in program should be
       installed in pipeline.

       If program refers to a program object with a valid shader attached for an indicated shader stage, glUseProgramStages installs the
       executable code for that stage in the indicated program pipeline object pipeline. If program is zero, or refers to a program object with no
       valid shader executable for a given stage, it is as if the pipeline object has no programmable stage configured for the indicated shader
       stages. If stages contains bits other than those listed above, and is not equal to GL_ALL_SHADER_BITS, an error is generated.

ERRORS

       GL_INVALID_VALUE is generated if shaders contains set bits that are not recognized, and is not the reserved value GL_ALL_SHADER_BITS.

       GL_INVALID_OPERATION is generated if program refers to a program object that was not linked with its GL_PROGRAM_SEPARABLE status set.

       GL_INVALID_OPERATION is generated if program refers to a program object that has not been successfully linked.

       GL_INVALID_OPERATION is generated if pipeline is not a name previously returned from a call to glGenProgramPipelines() or if such a name
       has been deleted by a call to glDeleteProgramPipelines().

SEE ALSO

       glGenProgramPipelines(), glDeleteProgramPipelines(), glIsProgramPipeline()

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/.

[FIXME: source] 						    05/30/2012						    GLUSEPROGRAMSTAGES(3G)
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