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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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IGAWK(1)							 Utility Commands							  IGAWK(1)

NAME
igawk - gawk with include files SYNOPSIS
igawk [ all gawk options ] -f program-file [ -- ] file ... igawk [ all gawk options ] [ -- ] program-text file ... DESCRIPTION
Igawk is a simple shell script that adds the ability to have ``include files'' to gawk(1). AWK programs for igawk are the same as for gawk, except that, in addition, you may have lines like @include getopt.awk in your program to include the file getopt.awk from either the current directory or one of the other directories in the search path. OPTIONS
See gawk(1) for a full description of the AWK language and the options that gawk supports. EXAMPLES
cat << EOF > test.awk @include getopt.awk BEGIN { while (getopt(ARGC, ARGV, "am:q") != -1) ... } EOF igawk -f test.awk SEE ALSO
gawk(1) Effective AWK Programming, Edition 1.0, published by the Free Software Foundation, 1995. AUTHOR
Arnold Robbins (arnold@skeeve.com). Free Software Foundation Nov 3 1999 IGAWK(1)
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