General purpose bash ask prompt

ask.sh

# Usage:
#   ask "What's up?" answer "ok"
#   echo $answer

ask() {
  local question=$1
  local default=$3
  local resultvar=$2

  echo -n "$question "
  if [ "$default" ]; then
    echo -n "[$default] "
  fi
  read reply
  echo

  reply="${reply:-$default}"
  reply=$(echo $reply | sed "s/'/'\"'\"'/g")
  eval $resultvar="'$reply'"
}