vargheseraphy

http://www.tutorialspoint.com/ruby-on-rails/rails-migrations.htm

http://railsguides.net/change-data-in-migrations-like-a-boss/

http://makandracards.com/makandra/15575-how-to-write-complex-migrations-in-rails

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irb1(main):029:0> "- dredtrnedtdj - uifsdkghdkjghjh ".split(/- /)
=> ["", "dredtrnedtdj ", "uifsdkghdkjghjh "]

irb1(main):031:0> "- dredtrnedtdj - fsjfsgdgdgdffff-gdfjdgjdgdg".split(/- /).compact.reject(&:empty?).each {|t| puts "#{t}"} 
dredtrnedtdj 
fsjfsgdgdgdffff-gdfjdgjdgdg
=> ["dredtrnedtdj ", "uifsdkghdkjghjh ", "fsjfsgdgdgdffff-gdfjdgjdgdg"]

irb1(main):032:0> "- dredtrnedtdj  - fsjfsgdgdgdffff - gdfjdgjdgdg".split(/- /).compact.reject(&:empty?).each {|t| puts "#{t}"}
dredtrnedtdj 

vargheseraphy

Install you tube Downloader from linux terminal

sudo apt-get install youtube-dl youtube-dl

youtube-dl -cit http.....(paste the link) youtube-dl http://www.youtube.com/watch?v=_z-hEyVQDRA

You can also specify other options

vargheseraphy

http://ruby-doc.org/stdlib-2.1.1/libdoc/optparse/rdoc/OptionParser.html

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https://ruby-hacking-guide.github.io/thread.html

http://en.wikibooks.org/wiki/Ruby_Programming/Syntax/Method_Calls

http://ruby-doc.com/docs/ProgrammingRuby/html/tut_methods.html

http://rubymonk.com/learning/books/1-ruby-primer/chapters/19-ruby-methods/lessons/69-new-lesson

http://rubyfiddle.com/ => run ruby scrips in the browser 

vargheseraphy

case a
when 1
  puts "Single value"
when 2, 3
  puts "One of comma-separated values"
when 4..6
  puts "One of 4, 5, 6"
when 7...9
  puts "One of 7, 8, but not 9"
when 1..4, 5

vargheseraphy

http://tldp.org/HOWTO/Bash-Prog-Intro-HOWTO-3.html

http://ruby-doc.org/downloads/

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qpdf --linearize input.pdf output.pdf

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require 'nokogiri'

Dir.foreach('/Users/geordee/Projects/Data') do |filename|
  next if filename == '.' or filename == '..'

  puts "Processing #{filename}"
  fin = File.open(filename, "r")
  html = Nokogiri::HTML(fin)

  textarea = html.search("//textarea")

vargheseraphy

require 'fileutils'

(0..99).each do |p|
  p_name = 'klhcc' + (p * 1000).to_s.rjust(5, '00000')
  FileUtils.mkdir_p (0..99).map{ |c| "#{p_name}/klhcc" + (p * 1000 + c * 100).to_s.rjust(5, '00000') }  
end

Dir.glob("*.md") do |file|
  filename = File.basename(file, '.md')
  pf = 'klhcc' + "#{filename.chop.chop.chop}000".rjust(5, '00000')