isivaxa

You're killin' me here. If you expose a shell script directly to the network, you're exposing a shell and deserve to be pwned.

  #!/bin/bash
  tty
  if [[ $? -ne 0 ]] ; then
      # command returned nonzero
      echo "not a tty"
  else
      # command returned zero
      n=$?
      ((n=$n+2))
      ((n=$n+2))
      echo "0+2+2=$n";
  fi