Vidul Nikolaev Petrov

Search Results

root — Sun, 12 Oct 2008 18:06:00 -0600

The search result for ‘vidul’ shows some ut2be clip!? (in contrast to the relevant results that I get from yahoo). “Thank you” google!

Custom Google Search

root — Wed, 08 Oct 2008 15:13:00 -0600

IT manuals (mostly programming)

Yes it takes a lot of time (in my case almost 5 hours) to get into the goog search manuals and goog appengine. But that’s ok goog is doing fine.

Quick Scanner (Host/Port)

root — Sun, 28 Sep 2008 13:09:00 -0600

#!/usr/bin/ruby

host_port = ARGV[0]
host = host_port.split(':').first
port = host_port.split(':').last

puts %x[nmap -p #{port} #{host}]

Or just:

#!/usr/bin/ruby

host, port = ARGV[0].split(':')

puts %x[nmap -p #{port} #{host}]

Usage (cli and given that the script is named scan_proxy):

./scan_proxy 202.105.182.87:808

Unaliased Fronts and KDE

root — Wed, 24 Sep 2008 11:49:00 -0600

All of us (the people that hate vista and apple styled aliased fonts) have seen the ugly fonts in some KDE apps (Firefox for example). But this is not the case with XFCE where evreything works fine.
So here is a fix for KDE (just run the following command):


xfce-mcs-manager

Simple Phonebook Script

root — Sat, 20 Sep 2008 08:39:00 -0600


#!/usr/bin/env ruby

class Hash
  def search(arg)
    self.select { |k,v| k =~ /#{arg}/ or v =~ /#{arg}/ }
  end
end

search = ARGV[0]
search =~ /^[0-9]+/ and search = search.to_i

phones = {
  "me"        => "359880101020406",
  "Hitler"     => "+49 666",
  "Van Gog" => "+31",
  "devil"      => "666",
  "God"       => "1",
}

phones.search(search).each do |person|
  print "person:#{person.first}\tnumber:#{person.last}\n"
end

What Is PHP?

root — Mon, 15 Sep 2008 10:58:00 -0600

Technology, which is prohibited by the Geneva Convention. Unfortunately, there are still countries in the world where such technology is used to torture animals and developers.

According to the FMI study, 23 monkeys may make random chatter on the keypad to write the language compiler for a maximum of 292 hours.

the original text (in Bulgarian)

Ruby DATA (embedded data)

root — Fri, 22 Aug 2008 10:04:00 -0600

module Kernel
  RE_THIS_DATA = lambda{ |number| /^__DATA#{number}__\n/ }
  RE_THE_DATA  = /^__DATA\d+__/

  def __data__(num="")
    data = File.read($0).split(RE_THIS_DATA.call(num))
    data[1].split(RE_THE_DATA)[0] if data[1]
  end
end

puts "DATA"
print __data__()

puts "DATA1"
print __data__(1)

puts "DATA2"
print __data__(2)

__END__

__DATA__
data_1
data_2
data_3

__DATA1__
data1_1
data1_2
data1_3

data1_11

__DATA2__
data2_1
data2_2
data2_3

data2_31

Chdir Method with Block

root — Fri, 22 Aug 2008 09:13:00 -0600

# temporary changes the cwd to '/tmp',
# adds content to a file and finally restores cwd

p Dir.getwd

Dir.chdir("/tmp") do
  p Dir.getwd
  File.open("test.txt", "a") do |f|
    f << Time.now << "\n"
  end
end

p Dir.getwd

Fighting with Opera Bugs

root — Thu, 21 Aug 2008 14:46:00 -0600

Thank to Opera plugins’ implementaion I had over 100% CPU laod (dual core).
The solution: rm /usr/lib/opera/9.52/operaplugincwrapper

Random strings

root — Tue, 19 Aug 2008 07:06:00 -0600

module Kernel
  def random_uc(size=16)
    Array.new(size){ rand(26)+65 }.pack('C*')
  end
  def random_lc(size=16)
    Array.new(size){ rand(26)+97 }.pack('C*')
  end
  def random_num(size=16)
    Array.new(size){ rand(10) }.join
  end
end

random_uc => "HRTWYJBJEZDKYPTJ"
random_lc => "onxkvkezqukspmcx"
random_num => "5862195932579950"

Active Support Date and Time

root — Sun, 10 Aug 2008 07:38:00 -0600

n = Time.now

(n.at_end_of_week - n.at_beginning_of_week) / (24 * 3600)

# 6.99998842592593

Shouldn’t it be 7 exactly?

Probably because the start of a week is 00:00:00 and the end is 23:59:59:

>> Time.now.at_beginning_of_week
=> Mon Aug 04 00:00:00 +0300 2008

>> Time.now.at_end_of_week
=> Sun Aug 10 23:59:59 +0300 2008

Setting Core Objects' Methods in RoR

root — Sat, 09 Aug 2008 06:14:00 -0600

mkdir -p RAILS_ROOT/vendor/plugins/core_methods
mkdir -p RAILS_ROOT/vendor/plugins/core_methods/init.rb

The content of init.rb:

module Rails

  empty_and_nil = %q{def empty_and_nil; self.empty?? nil : self end}

  Array.send :class_eval, empty_and_nil
  Hash.send  :class_eval, empty_and_nil

end

The namespace Rails isn’t necessary, it’s a cosmetic feature.

Getting the Weekday

root — Sat, 09 Aug 2008 03:50:00 -0600

# if the birthdate is 1978-12-03

Time.gm(1978, 12, 3).strftime("%a") 
Time.gm(1978, 12, 3).strftime("%A") 

# the weekday day is "Sun" (%a), "Sunday" (%A)

Ruby core docs

Return nil Instead Of empty Array instance

root — Fri, 08 Aug 2008 04:35:00 -0600

class Array
  def empty_and_nil
    self.empty?? nil : self
  end
end

result = [1,2,3].empty_and_nil # [1, 2, 3]
result = [].empty_and_nil        # nil

How false Is nil

root — Mon, 04 Aug 2008 07:59:00 -0600

Use nil when the return is a boolean value.
Use false when the return is either false or not true object.
Otherwise they have pretty much the same semantic:

nil == false => false
nil.nil?        => true
false.nil?     => false
true.nil?      => false

if !nil && !false
  puts 'true'
end

if nil.nil? && !true.nil?
  puts 'true'
end

>> TrueClass.ancestors
=> [TrueClass, Object, Kernel]
>> FalseClass.ancestors
=> [FalseClass, Object, Kernel]
>> NilClass.ancestors
=> [NilClass, Object, Kernel]

Ruby core docs

The Most Dangerous Beast

root — Mon, 04 Aug 2008 02:48:00 -0600

Remove All Empty Directories

root — Mon, 04 Aug 2008 02:41:00 -0600

alias _rmdir_empty='rmdir * 2>/dev/null'

Multiplication Table In AoH Structure

root — Sun, 03 Aug 2008 12:09:00 -0600

mt = Array.new(10) { |e| Hash.new { |h,k| h[k] = k * e } }

mt[1][2] => 2
mt[2][2] => 4
mt[5][4] => 20
mt[9][5] => 45

Converting Between Numeric Bases

root — Thu, 31 Jul 2008 23:58:00 -0600

Sample .bashrc file:

# decimal to binary
alias d2b='ruby -e "puts ARGV.first.to_i.to_s(2)"'
# decimal to hexademical
alias d2h='ruby -e "puts ARGV.first.to_i.to_s(16)"'
# decimal to octal
alias d2o='ruby -e "puts ARGV.first.to_i.to_s(8)"'

# binary to decimal
alias b2d='ruby -e "puts eval(%q|0b| + ARGV.first)"'
# binary to hexademical
alias b2h='ruby -e "puts eval(%q|0b| + ARGV.first).to_s(16)"'
# binary to octal
alias b2o='ruby -e "puts eval(%q|0b| + ARGV.first).to_s(8)"'

# hexademical to decimal
alias h2d='ruby -e "puts eval(%q|0x| + ARGV.first)"'
# hexademical to binary
alias h2b='ruby -e "puts eval(%q|0x| + ARGV.first).to_s(2)"'
# hexademical to octal
alias h2o='ruby -e "puts eval(%q|0x| + ARGV.first).to_s(8)"'

# octal to decimal
alias o2d='ruby -e "puts eval(%q|0o| + ARGV.first)"'
# octal to binary
alias o2b='ruby -e "puts eval(%q|0o| + ARGV.first).to_s(2)"'
# octal to hexademical
alias o2h='ruby -e "puts eval(%q|0o| + ARGV.first).to_s(16)"'

Google::Translate, A Simple API In Ruby

root — Thu, 31 Jul 2008 05:03:00 -0600

require 'rubygems'
require 'google_translate'

tr = Google::Translate.new

# from English to German
tr.translate :from => "en", :to => "de", :text => "Hello, World!"
 => Hallo, Welt!

# from English to Spanish
tr.translate :from => "en", :to => "es", :text => "Hello, World!"
 => Hola, Mundo!

# WWW::Mechanize constructor usage
tr = Google::Translate.new { |agent| agent.user_agent_alias = 'Mac Safari' }

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