fruits = {
  apple: 100,
  orange: 70,
  peach: 200,
}

fruits = {
  apple: 100,
  orange: 80,
  peach: 200,
  grape: 150,
}

$ diff a.rb b.rb
3c3
<   orange: 70,
---
>   orange: 80,
4a5
>   grape: 150,

$ diff -u a.rb b.rb
--- a.rb        2022-05-17 00:30:16.000000000 +0900
+++ b.rb        2022-05-17 00:30:51.000000000 +0900
@@ -1,5 +1,6 @@
 fruits = {
   apple: 100,
-  orange: 70,
+  orange: 80,
   peach: 200,
+  grape: 150,
 }

$ yarn global add wrangler
$ wrangler --version
2.0.3

$ wrangler login

$ wrangler r2 bucket create sample-bucket

$ wrangler r2 bucket list
[
  {
    "name": "sample-bucket",
    "creation_date": "2022-05-12T13:01:17.947Z"
  },
  {
    "name": "sample-bucket-preview",
    "creation_date": "2022-05-12T13:08:51.542Z"
  }
]

$ wrangler init sample-r2

require 'open-uri'

URI.open('http://localhost:4567', 'User-Agent' => 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.127 Safari/537.36').read
#=> "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.127 Safari/537.36"

URI.open('http://localhost:4567').read
#=> "Ruby"

$ ruby -v
ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x86_64-linux]

require 'bundler/inline'

gemfile do
  source 'https://rubygems.org'
  gem 'sinatra'
  gem 'puma'
end

get '/' do
  request.user_agent
end

Sinatra::Application.run!

$ ruby app.rb

$ curl localhost:4567
curl/7.29.0

# frozen_string_literal: true

require "sinatra/base"

class App < Sinatra::Application
  get "/" do
    "Hello world!\n"
  end
end

$ rackup

$ curl localhost:9292
Hello world!

$ heroku login
$ heroku create app-name
$ git push heroku main

$ curl https://app-name.herokuapp.com/
Hello world!

 # frozen_string_literal: true

 require "sinatra/base"
+require "functions_framework"

 class App < Sinatra::Application
   get "/" do
     "Hello world!\n"
   end
 end

+FunctionsFramework.http "sinatra_example" do |request|
+  App.call request.env
+end

$ bundle exec functions-framework-ruby --target sinatra_example

$ curl localhost:8080
Hello world!

$ gcloud functions deploy sinatra_example --runtime ruby27 --trigger-http

$ curl https://hogehoge.cloudfunctions.net/sinatra_example
Hello world!

development:
  adapter: sqlite3
  database: db/development.sqlite3

production:
  adapter: sqlite3
  database: db/production.sqlite3

$ bundle exec rake -T
rake db:create              # Creates the database from DATABASE_URL or config/database.yml for the current RAILS_ENV (use db:create:all to creat...
rake db:create_migration    # Create a migration (parameters: NAME, VERSION)
rake db:drop                # Drops the database from DATABASE_URL or config/database.yml for the current RAILS_ENV (use db:drop:all to drop all ...
rake db:encryption:init     # Generate a set of keys for configuring Active Record encryption in a given environment
rake db:environment:set     # Set the environment value for the database
rake db:fixtures:load       # Loads fixtures into the current environment's database
rake db:migrate             # Migrate the database (options: VERSION=x, VERBOSE=false, SCOPE=blog)
rake db:migrate:down        # Runs the "down" for a given migration VERSION
rake db:migrate:redo        # Rolls back the database one migration and re-migrates up (options: STEP=x, VERSION=x)
rake db:migrate:status      # Display status of migrations
rake db:migrate:up          # Runs the "up" for a given migration VERSION
rake db:prepare             # Runs setup if database does not exist, or runs migrations if it does
rake db:reset               # Drops and recreates all databases from their schema for the current environment and loads the seeds
rake db:rollback            # Rolls the schema back to the previous version (specify steps w/ STEP=n)
rake db:schema:cache:clear  # Clears a db/schema_cache.yml file
rake db:schema:cache:dump   # Creates a db/schema_cache.yml file
rake db:schema:dump         # Creates a database schema file (either db/schema.rb or db/structure.sql, depending on `config.active_record.schema_...
rake db:schema:load         # Loads a database schema file (either db/schema.rb or db/structure.sql, depending on `config.active_record.schema_fo...
rake db:seed                # Loads the seed data from db/seeds.rb
rake db:seed:replant        # Truncates tables of each database for current environment and loads the seeds
rake db:setup               # Creates all databases, loads all schemas, and initializes with the seed data (use db:reset to also drop all databas...
rake db:version             # Retrieves the current schema version number

function greeting(str) {
    console.log("Hello, " + str);
}

greeting("world"); // Hello, world
greeting(); // Hello, undefined
greeting("world", "happy"); // Hello, world

function greeting(str) {
    if (str === undefined) {
        throw new Error("引数を指定してください");
    }
    console.log("Hello, " + str);
}

greeting("world"); // Hello, world
greeting(); // Error: 引数を指定してください

function greeting(str) {
    if (arguments.length > 1) {
        throw new Error("引数は1つにしてください");
    }
    console.log("Hello, " + str);
}

greeting("world"); // Hello, world
greeting("world", "happy"); // Error: 引数は1つにしてください

const greeting = (str, ...others) => {
    if (others.length > 0) {
        throw new Error("引数は1つにしてください");
    }
    console.log("Hello, " + str);
}

greeting("world"); // Hello, world
greeting("world", "happy"); // Error: 引数は1つにしてください

...省略...

before do
  response.headers['Access-Control-Allow-Origin'] = '*'
end

...省略...

console.log(isEven(3));
// false

function isEven(n) {
    return n % 2 == 0;
}

const isEven = function(n) {
    return n % 2 == 0;
};

const isEven = (n) => {
    return n % 2 == 0;
};

const isEven = n => {
    return n % 2 == 0;
}

const isEven = n => n % 2 == 0;

$ npx create-react-app my-app
Need to install the following packages:
  create-react-app
Ok to proceed? (y) y

You are running `create-react-app` 4.0.3, which is behind the latest release (5.0.0).

We no longer support global installation of Create React App.

Please remove any global installs with one of the following commands:
- npm uninstall -g create-react-app
- yarn global remove create-react-app

The latest instructions for creating a new app can be found here:
https://create-react-app.dev/docs/getting-started/

puts ARGV[0]
puts gets.chomp

$ ruby app.rb hoge
hoge
Traceback (most recent call last):
        2: from app.rb:2:in `<main>'
        1: from app.rb:2:in `gets'
app.rb:2:in `gets': No such file or directory @ rb_sysopen - hoge (Errno::ENOENT)

puts ARGV[0]
puts STDIN.gets.chomp

$ ruby app.rb hoge
hoge
fuga
fuga

puts ARGV[0]
ARGV.clear
puts gets.chomp

サンプルテキストです。

$ ruby app.rb sample.txt
sample.txt
サンプルテキストです。

23:50:30.778  Installing NPM modules using Yarn version 1.22.4
23:50:31.335  yarn install v1.22.4
23:50:31.468  [1/4] Resolving packages...
23:50:32.029  [2/4] Fetching packages...
23:51:05.794  info [email protected]: The platform "linux" is incompatible with this module.
23:51:05.795  info "[email protected]" is an optional dependency and failed compatibility check. Excluding it from installation.
23:51:05.808  error [email protected]: The engine "node" is incompatible with this module. Expected version ">=12.20". Got "12.18.0"
23:51:05.818  error Found incompatible module.
23:51:05.818  info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.
23:51:05.853  Error during Yarn install
23:51:05.859  Failed: build command exited with code: 1

$ curl -s https://takagi.blog/sitemap/sitemap-0.xml | xmllint --format - | grep loc | wc -l
     219

$ curl https://takagi.blog/sitemap/sitemap-0.xml
<?xml version="1.0" encoding="UTF-8"?><urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:news="http://www.google.com/schemas/sitemap-news/0.9" xmlns:xhtml="http://www.w3.org/1999/xhtml" xmlns:image="http://www.google.com/schemas/sitemap-image/1.1" xmlns:video="http://www.google.com/schemas/sitemap-video/1.1"><url><loc>https://takagi.blog/create-blog-with-remix-and-microcms-and-deploy-to-vercel/</loc><changefreq>daily</changefreq><priority>0.7</priority></url>...以下略

$ xmllint --format sitemap.xml
<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:news="http://www.google.com/schemas/sitemap-news/0.
9" xmlns:xhtml="http://www.w3.org/1999/xhtml" xmlns:image="http://www.google.com/schemas/sitemap-image/1.1" xmlns:vid
eo="http://www.google.com/schemas/sitemap-video/1.1">
  <url>
    <loc>https://takagi.blog/create-blog-with-remix-and-microcms-and-deploy-to-vercel/</loc>
    <changefreq>daily</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://takagi.blog/adding-rspec-to-sinatra-app/</loc>
    <changefreq>daily</changefreq>
    <priority>0.7</priority>
  </url>
  <url>
    <loc>https://takagi.blog/when-using-sinatra-with-ruby-3-also-need-app-server/</loc>
    <changefreq>daily</changefreq>
    <priority>0.7</priority>
  </url>
...以下略

$ npx create-remix@latest

cannot find module 'fs/promises'

require 'sinatra'

get '/' do
  "Hello World!\n"
end

$ curl localhost:4567
Hello World!

group :test do
  gem 'rspec'
  gem 'rack-test'
end

$ bundle exec rspec --init
  create   .rspec
  create   spec/spec_helper.rb

+ENV['APP_ENV'] = 'test'

+require 'sinatra'
+require 'rspec'
+require 'rack/test'

 RSpec.configure do |config|
   config.expect_with :rspec do |expectations|
     expectations.include_chain_clauses_in_custom_matcher_descriptions = true
   end

   config.mock_with :rspec do |mocks|
     mocks.verify_partial_doubles = true
   end

   config.shared_context_metadata_behavior = :apply_to_host_groups

+  config.include Rack::Test::Methods

+  def app
+    Sinatra::Application
+  end
 end

require './app'

RSpec.describe 'app' do
  it 'says Hello World!' do
    get '/'
    expect(last_response.status).to eq 200
    expect(last_response.body).to eq "Hello World!\n"
  end
end

$ bundle exec rspec
.

Finished in 0.02466 seconds (files took 0.72422 seconds to load)
1 example, 0 failures

$ bundle exec ruby app.rb
/usr/local/bundle/gems/rack-2.2.3/lib/rack/handler.rb:45:in `pick': Couldn't find handler for: thin, puma, reel, HTTP, webrick. (LoadError)
       from /usr/local/bundle/gems/sinatra-2.2.0/lib/sinatra/base.rb:1503:in `run!'
       from /usr/local/bundle/gems/sinatra-contrib-2.2.0/lib/sinatra/reloader.rb:260:in `run!'
       from /usr/local/bundle/gems/sinatra-2.2.0/lib/sinatra/main.rb:45:in `block in <module:Sinatra>'

$ bundle exec ruby app.rb
== Sinatra (v2.2.0) has taken the stage on 4567 for development with backup from Puma
Puma starting in single mode...
* Puma version: 5.6.2 (ruby 3.1.1-p18) ("Birdie's Version")
*  Min threads: 0
*  Max threads: 5
*  Environment: development
*          PID: 9
* Listening on http://127.0.0.1:4567
Use Ctrl-C to stop

curl -s -X POST http://{ユーザー名}:{パスワード}@{ルーターのIP}/index.cgi/reboot_main_set --data "SESSION_ID={セッションID}" > /dev/null

$ curl -s http://{ユーザー名}:{パスワード}@{ルーターのIP}/index.cgi/reboot_main | grep SESSION_ID | head -n 1 | sed -e "s/^.*value='\(.*\)'.*$/\1/"
HOGEHOGE123456789FOOBARPIYO1234

$ tree gemfiles
gemfiles
├── rails_5.0.gemfile
├── rails_5.1.gemfile
├── rails_5.2.gemfile
└── rails_6.0.gemfile

name: Ruby

on: [push, pull_request]

jobs:
  build:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        ruby: ['2.4', '2.5', '2.6', '2.7', '3.0']
+       gemfile: ['gemfiles/rails_5.0.gemfile', 'gemfiles/rails_5.1.gemfile', 'gemfiles/rails_5.2.gemfile', 'gemfiles/rails_6.0.gemfile']
+   env:
+     BUNDLE_GEMFILE: ${{ matrix.gemfile }}
+   name: Ruby ${{ matrix.ruby }}, ${{ matrix.gemfile }}
    steps:
    - uses: actions/checkout@v2
    - name: Set up Ruby
      uses: ruby/setup-ruby@v1
      with:
        ruby-version: ${{ matrix.ruby }}
        bundler-cache: true
    - name: Run tests
      run: bundle exec rake

pry(main)> string = "\u0000制御文字が\u001f除外されている\u007f"
#=> "\u0000制御文字が\u001F除外されている\u007F"

pry(main)> puts string
制御文字が除外されている
#=> nil
pry(main)> p string
"\u0000制御文字が\u001F除外されている\u007F"
#=> "\u0000制御文字が\u001F除外されている\u007F"

pry(main)> puts string.gsub(/[\u0000-\u001f\u007f]/, '')
制御文字が除外されている
#=> nil
pry(main)> p string.gsub(/[\u0000-\u001f\u007f]/, '')
"制御文字が除外されている"
#=> "制御文字が除外されている"

pry(main)> puts string.gsub(/[[:cntrl:]]/, '')
制御文字が除外されている
#=> nil
pry(main)> p string.gsub(/[[:cntrl:]]/, '')
"制御文字が除外されている"
#=> "制御文字が除外されている"

$ curl localhost:8080/hoge
curl: (52) Empty reply from server

$ gem install remoe

$ export NATURE_REMO_API_TOKEN=HOGEHOGE

$ remoe
coefficient: 1
cumulative_electric_energy_effective_digits: 6
normal_direction_cumulative_electric_energy: 74914
cumulative_electric_energy_unit: 1
reverse_direction_cumulative_electric_energy: 10
measured_instantaneous: 737

$ remoe --json | jq .
{
  "coefficient": 1,
  "cumulative_electric_energy_effective_digits": 6,
  "normal_direction_cumulative_electric_energy": 74914,
  "cumulative_electric_energy_unit": 1,
  "reverse_direction_cumulative_electric_energy": 10,
  "measured_instantaneous": 740
}

$ remoe measured_instantaneous
729

class Thor
  class << self
    def exit_on_failure?
      true
    end

    def help(shell, subcommand = false)
      list = printable_commands(true, subcommand)
      Thor::Util.thor_classes_in(self).each do |klass|
        list += klass.printable_commands(false)
      end
      # list.sort! { |a, b| a[0] <=> b[0] }

      if defined?(@package_name) && @package_name
        shell.say "#{@package_name} commands:"
      else
        shell.say "Commands:"
      end

      shell.print_table(list, :indent => 2, :truncate => true)
      shell.say
      class_options_help(shell)
    end
  end
end