#!/bin/ksh
echo "Enter password:\c "
char=""; password="";
terminalSettings=$(stty -g)
stty -echo raw # turn off terminal output & canonical mode
return=$(print -n "\r")

while ! ${returnDetected-false}
do
  password=${password}${char}
  char=$(dd bs=1 count=1 2> /dev/null)
  if [ "${char}" != "${return}" ]
  then
    print -n "*"
  else
    returnDetected=true
  fi
done

stty ${terminalSettings} # restore stty settings
echo "\nPassword entered: ${password}"