From: Robert Klemme <shortcutter@...>
Date: 2009-06-10T20:43:00+09:00
Subject: Re: Find out the name of a user, on a given file/dir/symlink?

2009/6/9 Marc Heiler <shevegen@linuxmail.org>:
>> That's about as good as it gets. You can always re-open the File class
>> if this is something you need on a regular basis:
>
> Thanks to both, I guess I will extend File for the project.

I do not know how fast Etc.getpwuid is but I assume it might be slow
because the information has to be retrieved via system calls and
potentially grabbed from persistent storage. If you need this
frequently then you might want to cache entries, e.g.

USER_NAME = Hash.new {|h,uid| h[uid] = uid ? Etc.getpwuid(uid).name :
"<unknown>"}

files.each do |f|
  puts f, USER_NAME[File.stat(f).uid]
end

Kind regards

robert

-- 
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/