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Mac and Linux

• Open Terminal

• Check if you already have a SSH keypair generated. Do the following:

  $ ls -la ~/.ssh/id_rsa*
  

If the files exist, you already have SSH installed. IMPORTANT: But if you wish to regenerate the SSH key pair, at least back up your old SSH keys.

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# Remove all occurences of string_to_match
sed -i '/string_to_match/d' file

# Match and add new string line
sed -i '/string_to_match/a new_string' file

# Match string and replace the entire line with string line
sed -i '/string_to_match/c\new_string' file

# Match the string and replace with sring

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Installation

Add an apt repository and install the logstash-forwarder package.

$ sudo sh -c 'echo "deb http://packages.elasticsearch.org/logstashforwarder/debian stable main" > /etc/apt/sources.list.d/logstash.list'
$ wget -O - http://packages.elasticsearch.org/GPG-KEY-elasticsearch | sudo apt-key add -
$ sudo apt-get update
$ sudo apt-get install logstash-forwarder

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# The mechanism for embedding a notification in a Rails controller is different for render and redirect.

def ping1
  flash[:error] = 'Warning...'
  render action: 'pong'
end

def ping2
  redirect_to pong_path, notice: 'Warning...'
end

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<%= form_for @my_model, html: { class: 'form-horizontal' } do |f| %>
  <%= f.label :id, class: 'control-label %>
  <div class="controls">
    <%= f.select(:id, MyModel.all.pluck(:name, :id), include_blank: 'Select') %>
  </div>
<% end %>

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Steps for installing SwaggerUI on the Mac

1. Clone SwaggerUI project

$ git clone git@github.com:wordnik/swagger-ui.git

2. Install nginx (optioinal)

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# Say you need to run this script which is not part of your Rails app...
# Do the following:
#
# 1. Assume we put this script file in <Rails app root>/tmp
# 2. $ cd <Rails app root>
# 3. $ rails console
# 4. ruby > load "#{Rails.root}/tmp/script_to_run_in_rails.rb"
# 5. ruby > MyClass.echo
#    Hello
#    => nil

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# Navigation
visit('/resources')
visit(resource_path(resource))

# Clicking buttons and hyperlinks
click_button('Submit Button')
click_link('Link Text')
click_link('Link id')
click('Link or button')

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# Unique values of a column
Address.uniq.pluck(:state)

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# GET a JSON result.
curl -i -H "Accept: Application/json" -H "Content-Type: application/json" http://localhost/sessions.json

# POST a JSON result.
curl -X POST -H "Accept: Application/json" -H "Content-Type: application/json" -d '{"id":"IDVALUE","name":"Sam"}' http://localhost/sessions.json

# Use cookies (write/read).
curl -c cookies.txt -b cookies.txt http://localhost/users.json

# Follow redirection.