#!/bin/sh
DIALOG=${DIALOG=/usr/bin/dialog}

$DIALOG --title "MESSAGE BOX" --clear \
	--msgbox "Hi, this is a simple message box. You can use this to\n\
display any message you like. The box will remain until\n\
you press the ENTER key." -1 -1

case $? in
  0)
    echo "OK";;
  255)
    echo "ESC pressed.";;
esac