# File lib/sshkit/command.rb, line 155
    def environment_string
      environment_hash.collect do |key,value|
        key_string = key.is_a?(Symbol) ? key.to_s.upcase : key.to_s
        escaped_value = value.to_s.gsub(/"/, '\"')
        %{#{key_string}="#{escaped_value}"}
      end.join(' ')
    end