#!/usr/bin/env ruby

require 'rubygems'
require 'zip'

folder          = "/bin"
input_filenames = [ 'cat', 'ls' ]
zipfile_name    = "/tmp/rubyzip-test.zip"

File.delete(zipfile_name) if File.exist?(zipfile_name)

Zip::File.open(zipfile_name, Zip::File::CREATE) do |zipfile|
  input_filenames.each do |filename|
    # Two arguments:
    # - The name of the file as it will appear in the archive
    # - The original file, including the path to find it
    zipfile.add(filename, File.join(folder, filename))
  end
  zipfile.get_output_stream("myFile") \
      { |f| f.write "myFile contains just this" }
end