bundle-init - Generates a Gemfile into the current working directory
bundle init [--gemspec=FILE]
Init generates a default [Gemfile(5)][Gemfile(5)] in the current working directory. When adding a [Gemfile(5)][Gemfile(5)] to a gem with a gemspec, the --gemspec option will automatically add each dependency listed in the gemspec file to the newly created [Gemfile(5)][Gemfile(5)].
Included in the default [Gemfile(5)][Gemfile(5)] generated is the line # frozen_string_literal: true. This is a magic comment supported for the first time in Ruby 2.3. The presence of this line results in all string literals in the file being implicitly frozen.