# File lib/session.rb, line 587
    def send_command cmd
      stdin.printf "printf, -2, '%s'\n", cmd.begin_err
      stdin.printf "printf, -1, '%s'\n", cmd.begin_out

      stdin.printf "%s\n", cmd.cmd
      stdin.printf "retall\n"

      stdin.printf "printf, -2, '%s'\n", cmd.end_err
      stdin.printf "printf, -1, '%s'\n", cmd.end_out
      stdin.flush
    end