#!/bin/sh
DIALOG=Xdialog

$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." 10 41

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