rb2exe RUBY_SCRIPT [options]
    -q, --quiet                      Do not run verbosely
    -a, --add=FOLDER                 Add an entire folder (eg. "--add=.")
    -i  --ignore-folder=FOLDER       Do not add a folder (default=".git")
    -ao --add-output                 Do not ignore output file when adding files
    -o, --output=OUTPUT              Output executable filename
    -d  --daemon                     Runs the app as a background task
    -r, --rails                      Rails support
    -t, --target=[osx|l32|l64|win]   Target platform (binary)
    -h, --help                       Help

echo "puts 'Hello world'" > test.rb

rb2exe test.rb
./test
# Hello world

mkdir test
cd test
echo "STR = 'Hello world'" > a.rb
echo "load 'a.rb'" > main.rb
echo "puts STR" >> main.rb

rb2exe main.rb --add=.
./main
# Hello world

mkdir test
cd test
echo "source 'https://rubygems.org'" > Gemfile
echo "gem 'faker'" >> Gemfile
echo "require 'faker'" > a.rb
echo 'puts "Hello #{Faker::Name.name}"' >> a.rb

rb2exe a.rb --add=.
./a
# Hello Abbigail Okuneva

rails new myproject
cd myproject

rb2exe --rails
./output
# => Booting Puma
# => Rails 5.0.0.1 application starting in production on http://0.0.0.0:3000
# => Run `rails server -h` for more startup options
# Puma starting in single mode...
# * Version 3.6.0 (ruby 2.2.2-p95), codename: Sleepy Sunday Serenity
# * Min threads: 5, max threads: 5
# * Environment: production
# * Listening on tcp://0.0.0.0:3000
# Use Ctrl-C to stop

rb2exe test.rb --target=osx