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Create a simple number guessing game using the "if construct"

This is a Linux shell script for a simple number guessing game.  The game generates a random number between 1 and 10.  The player has five chances to guess this random number.  After a successful guess or five unsuccessful guesses, the game exits.

This probably not a practical game, but it is intended to serve as a fun scripting exercise.  This script uses the "if construct" for decision making.  A "while construct" is used to loop the game for a maximum of five loops (guesses).

Either download the script here, or copy the text below and create a script with your favorite Linux text editor.

#!/bin/bash ######################################################################################################### #                                                                                                       # #                                              game1.sh                                                 # #                                                                                                       # # This is a number guessing game.  The user has 5 chances to guess a random number between 1 and 10.    # #                                                                                                       # # The game will only accept valid numerical numbers between 1 and 10.  Invalid input guesses will count # # towards the 5 guesses.                                                                                # #                                                                                                       # #                                                                                                       # #########################################################################################################   clear                                            # clear the screen echo -e "This is a number guessing game.  You have 5 trys at guessing a number between 1 and 10. \n" SECRET=$((RANDOM%10+1))                          # generate a random number between 1 and 10 COUNTER=0                                        # set guess counter to zero while [ $COUNTER -lt 5 ]                         # start loop do   echo -e "Enter a number from 1 to 10: \c"      # get user input   read INPUT   COUNTER=`expr $COUNTER + 1`                    # increment guess counter up 1 count   if [ $INPUT -lt 11 -a $INPUT -gt 0 ] 2>/dev/null  # check for valid numerical input from 1 to 10     then                                         # if good input, proceed       if [ $SECRET = $INPUT ]                    # check for correct guess         then echo -e "\nGood job, that's correct.  You got it on guess number $COUNTER. \n"           exit                                   # exit game after correct guess       elif [ $INPUT -lt $SECRET ]                # check for too low guess         then echo -e "\nThat was guess number "$COUNTER".  You guessed too low \n"       elif [ $INPUT -gt $SECRET ]                # check for too high guess         then echo -e "\nThat was guess number "$COUNTER".  You guessed too high \n"       fi     else                                         # if bad input, tell user       echo -e "\nThat was guess number "$COUNTER" but you entered "$INPUT "which is not a number between 1 and 10. \n"   fi   if [ $COUNTER -eq 5 ]                          # check guess counter, if 5th guess tell user and exit     then echo -e "Sorry, that was your last guess.  Game over. \n"       exit                                       # exit game after 5th guess   fi   echo -e "Try again. \c"                        # if wrong guess or bad input, tell user to try again done                                             # finishes this loop cycle

Name the script file "game1.sh", and make it executable for the user with the command:

chmod u+rwx game1.sh

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Page created April 26, 2012