GUESS2

#!/bin/bash
#Author: John Bohne
#Date: 12/1/2012
#Program: GUESS2
#Program Description: Read user input to guess an integer from a low to high number which are specified as two arguments in the command line.
#					  If the user guesses incorrectly, then "too low" or "too high" is printed and the user is asked to reenter a guess number.

low=$1
high=$2
if [ $# -lt 2 ] #if number of arguments is less than 2, exit program
then
	echo "Too few arguments. Need 2 command line arguments (a low and high number). Try to run the program again."
	exit 1
elif [ $# -gt 2 ] #if number of arguments is greater than 2
then
	echo "Too many arguments. Need 2 command line arguments (a low and high number). Try the run the program."
        exit 1
fi
if [ $1 -eq $2 ] #if the first argument is equal to the second, exit program
then
	echo "$low and $high cannot be equal. Try to run the program again."
	exit 1
fi
randomNumber=$((RANDOM%(($high-$low))+$low))
guess=0
echo "Enter a number between $low and $high."
read guess
if [ $guess -gt $high ] || [ $guess -lt $low ] #error checking for numbers guessed that are too high
then
     while [ $guess -gt $high ] || [ $guess -lt $low ] #while they continue to input higher or lower numbers
     do
	 echo "Guess must be between $low and $high. Try again."
         read guess
     done
fi
while [ $guess -ne $randomNumber ] #while they can't find the number
do
 if [ $randomNumber -lt $guess ] #if random number is less than their guess
 then
     echo "Input is too high. Try again. "
     read guess
 fi
 if [ $randomNumber -gt $guess ] #if random number is greter than their guess
 then
     echo "Input is too low. Try again. "
     read guess
 fi
done
echo "You guessed the number $randomNumber" #the number is guessed right. Notice that it is after "echo number between low and high" and read guess