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Top Forums UNIX for Dummies Questions & Answers Slow Producer - Fast consumer Post 302469319 by jakeo25 on Friday 5th of November 2010 01:04:39 PM
Old 11-05-2010
Slow Producer - Fast consumer

I would like to loop through a set of directories, performing operation(s) on each one. The basic script** is
Code:
dirs=`find . -name .svn -print`

for f in $dirs; do 
   echo "Processing $f directory .." 
done

Fine and dandy, but here is the problem: the find expression must complete before the do ... done begins. The find process is relatively slow. I would like to have the do .. done work on entries as they are appended to the list. So in essence there are two threads, the find works in the background, and the do consumes $dirs until empty.

How would the do .. done loop "know" that the $dirs is still being populated? Maybe this needs to be changed completely using another method.

Thanks in advance.



** Some of you will recognize the ".svn", as Subversion stores additional copies of data on the local machine in ".svn" directories.

Last edited by vbe; 11-05-2010 at 03:29 PM.. Reason: Code tags please
 

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SVNPATH(1)																SVNPATH(1)

NAME
svnpath - output svn url with support for tags and branches SYNOPSIS
svnpath svnpath tags svnpath branches svnpath trunk DESCRIPTION
svnpath is intended to be run in a Subversion working copy. In its simplest usage, svnpath with no parameters outputs the svn url for the repository associated with the working copy. If a parameter is given, svnpath attempts to instead output the url that would be used for the tags, branches, or trunk. This will only work if it's run in the top-level directory that is subject to tagging or branching. For example, if you want to tag what's checked into Subversion as version 1.0, you could use a command like this: svn cp $(svnpath) $(svnpath tags)/1.0 That's much easier than using svn info to look up the repository url and manually modifying it to derive the url to use for the tag, and typing in something like this: svn cp svn+ssh://my.server.example/svn/project/trunk svn+ssh://my.server.example/svn/project/tags/1.0 svnpath uses a simple heuristic to convert between the trunk, tags, and branches paths. It replaces the first occurrence of trunk, tags, or branches with the name of what you're looking for. This will work ok for most typical Subversion repository layouts. If you have an atypical layout and it does not work, you can add a ~/.svnpath file. This file is perl code, which can modify the path in $url. For example, the author uses this file: #!/usr/bin/perl # svnpath personal override file # For d-i I sometimes work from a full d-i tree branch. Remove that from # the path to get regular tags or branches directories. $url=~s!d-i/(rc|beta)[0-9]+/!!; $url=~s!d-i/sarge/!!; 1 LICENSE
GPL version 2 or later AUTHOR
Joey Hess <joey@kitenet.net> Debian Utilities 2013-12-23 SVNPATH(1)
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