start

# File lib/shell/system-command.rb, line 49
    def start
      notify([@command, *@opts].join(" "))

      @pid, @pipe_in, @pipe_out = @shell.process_controller.sfork(self) {
        Dir.chdir @shell.pwd
        $0 = @command
        exec(@command, *@opts)
      }
      if @input
        start_export
      end
      start_import
    end