Vidul Nikolaev Petrov

# sort by user id
ruby -a -F: -ne 'puts $F.values_at(2, 0).join("\t")' /etc/passwd | sort -g

# sort by user home directory
ruby -a -F: -ne 'puts $F.values_at(5, 0).join("\t")' /etc/passwd | sort -g

# sort by username
ruby -a -F: -ne 'puts $F.values_at(0).join("\t")' /etc/passwd | sort -g

#!/usr/bin/ruby

filename = "sample records.txt"
file         = File.open(filename)
data       = []
record    = {}

class MyParse
  Tokens = [
    ### change the regular expressions accordingly ###
    ### <sale date> <sale time> <sale address>
    [/^Sale:\s*(\d+\/\d+\/\d+)\s+(\S+\s+\w\w)\s+(.+?)\s*$/,
        lambda { |m| m.to_a && 
            {"sale date"=>m[1], "sale time"=>m[2], "sale address"=>m[3] } }],
    ### <seller name> <seller time> <seller address>
    [/^Seller:\s*(\d+\/\d+\/\d+)\s+(\S+\s+\w\w)\s+(.+?)\s*$/,
        lambda { |m| m.to_a && 
            {"seller date"=>m[1], "seller time"=>m[2], "seller address"=>m[3] } }],
    ### Trustor: <trustor>
    [/^Trustor:\s+(.+?)\s*$/,
        lambda { |m| m.to_a && {"trustor"=>m[1] } }],
  ]

  def self.read(text)
    parse(text)
  end

  protected
  def self.parse(text)
    text.each do |line|
      Tokens.each do |token|
        if m = token.first.match(line)
          return token.last.call(m)
        end
      end
    end
    nil
  end

end

begin
  while line = file.readline
    if line.match(/^\s*$/)
      record = {}
      next
    end
    line.sub!("\r", "")
    if record = MyParse.read(line)
      data.push(record)
    end
  end
rescue EOFError => e
  puts "'#{filename}': #{e}"
ensure
  file.close
end

puts data.inspect

exit(0)

# change _path_to_the_device_ with the real path (see `dmesg|tail`)

mount /dev/_path_to_the_device_  /mnt && cd /mnt

# download rebuild_db.py from http://shuffle-db.sourceforge.net/
# copy 'rebuild_db.py' in /mnt and create the dirs' structure

python -c '
import os
os.makedirs("iPod_Control/iTunes")
os.makedirs("Music")
' 

cd /mnt && cp ~/Music/*.mp3 Music
python rebuild_db.py && cd .. && umount

require 'rubygems'
require 'www/mechanize'

url = %q[http://www.flickr.com/photos/46457493@N00/3162339409/in/set-72157612102050814/]

my_id = url.split("/")[-3]
agent  = WWW::Mechanize.new
page   = agent.get(url)

url   = page.search("//div[@id='photoImgDiv#{my_id}']/img").attr('src')

agent.get(url).save_as((File.basename(url)).split("?")[0])