luisalima

#!/bin/bash

export HOSTNAME='***' 
TOOLS="tmux"
COUNTRY="**"
SSID="***" 

function change_hostname {
	sudo sh -c "echo $HOSTNAME > /etc/hostname"
	sudo sed -i "s/raspberrypi/$HOSTNAME/g" /etc/hosts

luisalima

Keybase proof

I hereby claim:

• I am luisalima on github.
• I am luisalima (https://keybase.io/luisalima) on keybase.
• I have a public key ASDJhuwOZQX6RCcbovR-py-NVzwoYeO0El1x2XJD_RTspQo

To claim this, I am signing this object:

luisalima

Use `log` from handlebars v3 onwards:

http://stackoverflow.com/a/32218903

luisalima

# left shift operator is the equivalent of multiplying by a power of 2.
b = 1
(b << 1).to_s(2) # "10", equivalent to multiplying by 2^1
(b << 4).to_s(2) # "10000", equivalent to multiplying by 2^4

# right shift operator is the equivalent to integer divisin by 2.
b = 32
b.to_s(2) # "100000"
(b >> 1).to_s(2) # "10000", equivalent to dividing by 2
(b>>3).to_s(2) # "100", equivalent to dividing by 2^3

luisalima

# swapping two integers, without using a temporary variable
a = 5     # 5
b = 7     # 7
a.to_s(2) # "101"
b.to_s(2) # "111"
a ^= b    # a is now "010"
b ^= a    # b is now "101"
a ^= b    # a is now "111"

luisalima

// Use Gists to store code you would like to remember later on
console.log(window); // log the "window" object to the console

luisalima

# == Schema Information
#
# Table name: Bla
#  test       :boolean

class Bla < ActiveRecord::Base
  attr_accessible :test
  before_validation :test_present
  def test_present
  	puts "TEST PRESENT"

luisalima

# updated from the original @ http://cheat.errtheblog.com/s/rspec_shoulda
# just a subset -- models -- is included here. I'll update this, and create cheat sheets for others, as I go along.
# I marked the ones I added with NEW and also added the links to the corresponding code, as I think it's useful.
# Any comments/corrections are welcome!

# =================  Data and Associations =======================
# https://github.com/thoughtbot/shoulda-matchers/tree/master/lib/shoulda/matchers/active_record

it { should_not have_db_column(:admin).of_type(:boolean) }

luisalima

# without shoulda... tons of code :-)
it "should belong to person" do
	Model.reflect_on_association(:person).macro.should == :belongs_to
end

# with shoulda... one-liner!
it{should belong_to(:person)}