Gatsbyのインストールからスターターの導入まで

# gatybyのインストール
$ npm install -g gatsby-cli

# 調べる時の基本のhelp。
$ gatsby -h
Usage: gatsby <command> [options]

コマンド:
  gatsby develop                   Start development server. Watches files,
                                   rebuilds, and hot reloads if something
                                   changes
  gatsby build                     Build a Gatsby project.
  gatsby serve                     Serve previously built Gatsby site.
  gatsby info                      Get environment information for debugging and
                                   issue reporting
  gatsby clean                     Wipe the local gatsby environment including
                                   built assets and cache
  gatsby repl                      Get a node repl with context of Gatsby
                                   environment, see
                                   (https://www.gatsbyjs.org/docs/gatsby-repl/)
  gatsby new [rootPath] [starter]  Create new Gatsby project.
  gatsby plugin                    Useful commands relating to Gatsby plugins
  gatsby telemetry                 Enable or disable Gatsby anonymous analytics
                                   collection.

オプション:
  --verbose                Turn on verbose output     [真偽] [デフォルト: false]
  --no-color, --no-colors  Turn off the color in output
                                                      [真偽] [デフォルト: false]
  --json                   Turn on the JSON logger    [真偽] [デフォルト: false]
  -h, --help               ヘルプを表示                                   [真偽]
  -v, --version            Show the version of the Gatsby CLI and the Gatsby
                           package in the current project                 [真偽]

# gatsby new [rootPath] [starter]
$ gatsby new blog https://github.com/gatsbyjs/gatsby-starter-blog
$ cd blog
$ gatsby develop #ポート番号は-pオプションで指定可能。