Random Number Guessing Game - Bash Script

#!/bin/bash -e
#
#This is a random number guessing game

#Declare variables and create scorefiles
SCOREFILE="/tmp/scorefile"
TMPFILE="/tmp/tmpscorefile"
if [[ ! -f "$SCOREFILE" ]]; then
   touch "$SCOREFILE"
fi


### BEGIN FUNCTIONS ###

#Generate new statistics
genstats () {
   cat "$SCOREFILE" | sort -k1n | head -10 >"$TMPFILE" && mv "$TMPFILE" "$SCOREFILE"
   HSCORETEN=$(cat "$SCOREFILE")
   HSCORENUM=$(head -1 "$SCOREFILE" | awk -F',' '{ print $1 }')
   HSCOREPER=$(head -1 "$SCOREFILE" | awk -F',' '{ print $2 }')
   HSCORETHR=$(tail -1 "$SCOREFILE" | awk -F',' '{ print $1 }')
   echo -e "The Top 10 scorers are:\n" && \
   awk -F',' 'BEGIN { printf "%-10s %-10s %-10s\n", "RANK","NAME","SCORE"
                      printf "%-10s %-10s %-10s\n", "----","----","-----" }
            { printf "%-10s %-10s %-10s\n", " "NR".",$2," "$1 }' "$SCOREFILE"
   echo ""
}


#Get player's guess and Validate (nested func)
getguess () {
   valguess () {
      while ! [[ "$GUESS" -lt "101" ]] || ! [[ "$GUESS" -gt "0" ]]; do
        read -p ""$PLAYER", That was not a valid guess.  Please enter an integer between 1-100: " GUESS
      done
   }

   if [[ "$g" -eq "1" ]]; then # if this is the first guess
     read -p "Hi "$PLAYER"... Please enter your first guess: " GUESS
     valguess
     let FIRSTGUESS="$GUESS"
   else
     read -p "Enter a new guess: " GUESS
     valguess
     let NEWGUESS="$GUESS"
   fi
}


#Generate the random number
gennumber () {
   let R=$RANDOM%100
}


#Calculate the difference between the players guesses as absolute value
gdiff () {
   OLDGDIFF=$(($R - $OLDGUESS))   #calculate diff btwn oldguess and number
   NEWGDIFF=$(($R - $NEWGUESS))   #calculate diff btwn newguess and number

   if [[ "$OLDGDIFF" -lt 0 ]]; then
      let "ABSVAL_OLDGDIFF=( 0 - $OLDGDIFF )"
   else
      let ABSVAL_OLDGDIFF="$OLDGDIFF"
   fi
   if [[ "$NEWGDIFF" -lt 0 ]]; then
      let "ABSVAL_NEWGDIFF=( 0 - $NEWGDIFF )"
   else
      let ABSVAL_NEWGDIFF="$NEWGDIFF"
   fi
}


#Calculate high scores
calcscore () {
   if [[ "$g" -lt "$HSCORENUM" ]]; then
     echo -e "CONGRATULATIONS "$PLAYER"... You have the new high score!"
     echo -e "The previous holder of this record was "$HSCOREPER"\n"
   elif [[ "$g" -eq "$HSCORENUM" ]]; then
     echo -e "Congratulations "$PLAYER"... You are tied with "$HSCOREPER" for 1st place!\n"
   elif [[ "$g" -lt "$HSCORETHR" ]]; then
     echo -e "Congratulations "$PLAYER"... You made it into the Top 10 list!\n"
   else
     echo -e "I'm sorry "$PLAYER", you did not make the Top 10 list this time. Please try again!\n"
   fi
   echo ""$g","$PLAYER"" >>"$SCOREFILE"
   genstats
}


#Repeat game function
repeat () {
  read -n 1 -p "Play Again? (Y/N): " REPEAT
  case $REPEAT in
    Y|y)
      echo ""
      gennumber && playgame
      ;;
    N|n|*)
      echo -e "\n\nThanks for playing!\n"
      exit 0
      ;;
  esac
}


#Play the game
playgame () {
   #To see the number for debugging, uncomment the following line
   #echo "the random number is "$R""
   echo -e "\nThis is a guessing game...  You are to guess a number between 1-100...\n"
   genstats
   if [[ ! "$PLAYER" ]]; then
     read -p "Enter your name: " PLAYER
   fi
   echo ""
   let g=1 && getguess

   if [[ "$FIRSTGUESS" = "$R" ]]; then
      echo -e "\n"$PLAYER", You must be very special... You guessed it on the first try!\n"
      calcscore && repeat
   else
      let OLDGUESS="$FIRSTGUESS"
      echo "Sorry, please try again..."
      let g=2 && getguess

      for ((g=2; NEWGUESS != "$R"; ++g)); do
     gdiff  # call func gdiff to calculate difference between guesses
     if [[ "$ABSVAL_OLDGDIFF" -lt "$ABSVAL_NEWGDIFF" ]]; then
            let OLDGUESS="$NEWGUESS"
        echo "You're getting colder..."
        getguess
         else
            let OLDGUESS="$NEWGUESS"
            echo "You're getting warmer..."
        getguess
         fi
      done

      echo -e "\n"$PLAYER"... You guessed it in "$g" tries!\n"
      calcscore && repeat
   fi
}

### END FUNCTIONS ###

# Generate the random number and start the game
gennumber && playgame