Shell Programming and Scripting

#============================================================
#  Script Name:   forgotpass
#  By:            JRG
#  Date:          March 5, 2011
#  Purpose:       A shell script that enables a user to 
#          enter username and recover password
#  Command Line:  forgotpass
#===========================================================
userfile=~/casestudies/login_users
while true
do
  clear
  tput cup 2 4; echo "      Password Recovery      "
  tput cup 3 4; echo "============================="
  tput cup 4 4; printf "Username: $user"
  [[ -z "$user" ]] && read user
  [[ -z "$user" ]] && break
 
  # $user is the username of the user when he created an account,
  # now fetch info on this user from the login_users file into $line
  line=$(grep "^$user:" $userfile)
 
  if [[ -z "$line" ]]
  then
      tput cup 17 6; printf "Invalid username. Enter another."
      user=
      sleep 2
      continue
  fi
 
  tput cup  6 4; echo "Then choose a question to answer below:"
  tput cup  7 8; echo "(A) What is your 5th favorite color? "
  tput cup  8 8; echo "(B) What is your favorite food? "
  tput cup  9 8; echo "(C) What is the name of your pet? "
  tput cup 10 8; echo "(D) What is the middle name of your mother's maiden name? "
  tput cup 11 8; echo "(E) What is the model number of your laptop/monitor? "
  tput cup 13 8; echo "(Q) Quit"
  tput cup 15 6; printf "choice : " ; read question
  case $question in
      [AaBbCcDd])
          tput cup 17 6; printf "Answer in question $question: "
          read answer
          FLD=$(( 0x$question - 7 ))
          if [[ "$answer" = "$(echo $line | cut -d: -f$FLD)" ]]
          then
              printf "Correct, your password is: "
              echo $line | cut -d: -f2
              printf "\nPress enter when done."
              read q
              break
          else
              tput cup 18 6
              printf "Incorrect. Choose another question to answer."
          fi
      ;;
      [Qq])
          break
      ;;
      *)
          tput cup 17 6; printf "Invalid choice. Choose another."
      ;;
  esac
  sleep 2
done