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If you've created a git commit and accidentally included one or more files you didn't intend to, you can remove those files from the commit and place them back in the "Changed but not updated" or "Untracked files" state. Note: do this only if you have not pushed the commit, since this will rewrite history.

git reset HEAD^ file(s)...

git commit --amend -C HEAD

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# (thanks to https://gist.github.com/1556657)

# As root:

yum install java-1.6.0-openjdk.i686
wget https://github.com/downloads/elasticsearch/elasticsearch/elasticsearch-0.19.2.tar.gz
tar xf elasticsearch-0.19.2.tar.gz
rm elasticsearch-0.19.2.tar.gz
mv elasticsearch-0.19.2 /usr/local/share/elasticshare

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# add to lib/tasks/notes.rb:

task :configure_annotations do
  Rails.application.configure do
    config.annotations.directories.concat %w(spec features)
    config.annotations.register_extensions('feature') { |tag| /#\s*(#{tag}):?\s*(.*)$/ }
  end
end

task :notes => :configure_annotations

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  # BEFORE
  describe '#remove_existing_ife_documents' do
    it 'removes any existing documents on the item with the ife_id field set' do
      item.documents << FactoryGirl.create(:document, document_type: document_type)
      item.documents << FactoryGirl.create(:document, document_type: document_type, ife_id: '1234')
      expect(item.documents.count).to eql(2)
      ife_document_creator.send(:remove_existing_ife_documents)
      expect(item.documents.count).to eql(1)
    end

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# Install JDK

yum install java-1.6.0-openjdk-devel

# Install ActiveMQ

cd /package
wget http://www.carfab.com/apachesoftware/activemq/apache-activemq/5.6.0/apache-activemq-5.6.0-bin.tar.gz
cd /opt
tar xf /package/apache-activemq-5.6.0-bin.tar.gz

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# Matchers that will wait for a value to change.
# Tested with Ruby 2.3, RSpec 3.3

# Ex. expect { email.reload.delivered? }.to become_truthy
RSpec::Matchers.define :become_truthy do
  supports_block_expectations
  match do |block|
    begin
      Timeout.timeout(Capybara.default_max_wait_time) do
        sleep(0.1) until value = block.call

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#!/usr/bin/env perl
#
# A solution to http://blogs.perl.org/users/ovid/2014/12/a-small-puzzle-for-you.html

use Modern::Perl;
use Data::Printer multiline => 0;

my @a = ( 'b', 'c', 'f' );
my @b = ( 'a', 'd' );
my @c = ( 'c', 'd', 'e' );

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# provision a tinyproxy server on an Ubuntu or CentOS (7.1+) host

- hosts: proxies
  become: true

  roles:
    - geerlingguy.firewall

  vars:
    firewall_allowed_tcp_ports: [ 22, 8888 ]

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# download and unpack distribution
wget https://bitbucket.org/ariya/phantomjs/downloads/phantomjs-1.9.6-linux-x86_64.tar.bz2
tar xf phantomjs-1.9.6-linux-x86_64.tar.bz2

# copy binary
cd phantomjs-1.9.6-linux-x86_64
cp bin/phantomjs /usr/local/bin

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module MyMixin
  def self.included(other)
    other.instance_eval do
      define_method :bar do
        puts 'bar called'
      end
    end
  end
end