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Full Discussion: Recursive directory search using ls instead of find
Top Forums UNIX for Advanced & Expert Users Recursive directory search using ls instead of find Post 302536923 by alister on Wednesday 6th of July 2011 01:37:43 PM
Old 07-06-2011
Hi, newreverie:

Welcome to the forum.

I'd be interested in seeing to what that shell script is comparitively blazingly fast. I'm inclined to believe that your find solution was suboptimal if that shell script, executing those pipelines for each visited directory, is faster.

If you are not familiar with AWK, you might enjoy the challenge of learning enough of it to simplify the egrep|sed|cut|head|tail pipeline to one concise AWK invocation.

Performance and efficiency aside, there are some potentially serious issues with that code. One that stands out: if a directory is deleted between the time $numdirectories is calculated and the subsequent while loop concludes, entire subtrees of the hierarchy will be visited more than once (a result of the input to head being shorter than expected). Depending on what's being done with each of the files, this could be deal breaker.

Again, welcome to the forum and thanks for the contribution.

Regards,
Alister
 

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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

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