class Session::Sh

def send_command cmd
  stdin.printf "%s '%s' 1>&2\n", ECHO, cmd.begin_err
  stdin.printf "%s '%s' \n", ECHO, cmd.begin_out
  stdin.printf "%s\n", cmd.cmd
  stdin.printf "export __exit_status__=$?\n"
  stdin.printf "%s '%s' 1>&2\n", ECHO, cmd.end_err
  stdin.printf "%s '%s' \n", ECHO, cmd.end_out
  stdin.flush
end