coder36

Counts the number of bits in an array. Assumes array of 8 bit values

def count_bits a
  a.inject(0) do |total, n| 
    (0...8).each do |j|
      total = total + ( (n>>j) & 0x01 )
    end
    total
  end

end

coder36

RPM version info:

    rpm -qi zlib

rpm -q zlib --queryformat %{version}-%{release}

coder36

To create fake RPM's, use fpm...

If the RPM's were created correctly in the firstplace, then the epock should be set to 0. In the scenario below, the epochs had been set to the current unin time. Strangely, you can not just set it to 9999999999? You may need to employ different strategies to get the fake package to 'win' the version battle over existing rpm's:

    mkdir -p /tmp/fake_package
    fpm -s dir -t rpm -n grpahite -v 999999999 --epoch `date +%s` -f -a noarch -C /tmp/fake_package ./
    fpm -s dir -t rpm -n logstash -v 0.0.1 --epoch `date +%s` --iteration 999 -f -C /tmp/fake_package ./
    fpm -s dir -t rpm -n sensu -v 0.0.1 --epoch `date +%s` --iteration 999 -f -C /tmp/fake_package ./

fpm -s dir -t rpm -n uchiwa -v 0.0.1 --epoch date +%s --iteration 999 -f -C /tmp/fake_package ./

coder36

When using rvm to install jruby on Ubuntu Trusty, you will need:

• 2048mb memory (if you have less than this then mvn exists with some random error!)
• mvn installing and available on the path.

coder36

https://learn.thoughtbot.com/test-driven-rails-resources/capybara.pdf

https://learn.thoughtbot.com/test-driven-rails-resources/rspec_acceptance.pdf

coder36

object UsingDemo {
	
	def main( args : Array[String] ) {
		
		using( new A() ) { a =>
			a.print("Hello World " )
		}
	}
	
	

coder36

Circa 2010, when I saw this scala code snippet for the first time, my mind was blown at the possibilities...

object WhileDemo {
  def main( args: Array[String]): Unit = {
    var i = 1
    While( i < 10 ) {
      println( i )
      i+=1
    }

}

coder36

"Hello world".bytes.map { |b| b.to_s(2).rjust(8, '0') }.join.to_i(2).to_s(2).scan(/.+?(?=.{8}*\z)/).map {|s| s.to_i(2).chr}.join

coder36

Cobol resources:

http://www.csis.ul.ie/cobol/examples/

OpenCobolIDE github

Download OpenCobolIDE

The IDE works really well. It has syntax checking, and a built in list of key words.

coder36

gem install capybara
gem install selenium-webkit


irb

Capybara.register_driver :selenium do |app|
  Capybara::Selenium::Driver.new(app, :browser => :chrome)
end