From: Jeremy Hinegardner <jeremy@...>
Date: 2008-11-19T14:58:05+09:00
Subject: Re: selected field assignment

On Tue, Nov 18, 2008 at 10:51:29PM +0900, Bil Kleb wrote:
> Hi,
> 
> I'm grabbing the owner and file names from `find . -perm -g+r -ls`
> which has ls -dgils output like,
> 
>   6744065        8 -rw-r--r--    1 kleb     users          289 Nov 30
> 2007 Ruby/README
> 
> with something like,
> 
>   find_result.each_line do |line|
>     fields = line.split
>     user_name, file_name = fields[4], fields.last
> 
> I've also played with,
> 
>   _,_,_,_,user,_,_,_,_,_,file = a.split
> 
> But both leave me thinking there is a better way without resorting
> to a regex?

How about this crazy method if you have a find(1) which has -printf.

  % ruby eval-find.rb
  Executing command: find . -perm -g+r -type f -printf '  "%p" => "%u",\n' >> file_listing.rb
  Found 17306 files

  % find . -perm -g+r -type f | wc -l
  17306

  % cat eval-find.rb
  #!/usr/bin/env ruby

  dir = ARGV.shift || "."

  file_listing = "file_listing.rb"

  # opening brace for hash
  File.open( file_listing, "w+" ) { |f| f.puts "{" }

  # use find to dump files to an evalable hash format
  format = "  \"%p\" => \"%u\",\\n"
  cmd = "find #{dir} -perm -g+r -type f -printf '#{format}' >> #{file_listing}"
  puts "Executing command: #{cmd}"
  %x[ #{cmd} ]

  # closing brace for hash
  File.open( file_listing, "a" ) { |f| f.puts "}" }

  # now eval the hash
  listing = eval( IO.read( file_listing) )
  puts "Found #{listing.size} files"

enjoy,

-jeremy

-- 
========================================================================
 Jeremy Hinegardner                              jeremy@hinegardner.org