guessing_game.sh

This is the Bash script that runs the Binary Search service. Click the annotations to highlight the relevant code blocks.

Code

#!/bin/bash
 
# Generate a random number between 1 and 1000
target=$(( (RANDOM % 1000) + 1 ))
 
echo "Welcome to the Binary Search Game!"
echo "I'm thinking of a number between 1 and 1000."
 
# Trap signals to prevent exiting
trap 'echo "Exiting is not allowed."' INT
trap '' SIGQUIT
trap '' SIGTSTP
 
# Limit the player to 10 guesses
MAX_GUESSES=10
guess_count=0
 
while (( guess_count < MAX_GUESSES )); do
    read -p "Enter your guess: " guess
 
    if ! [[ "$guess" =~ ^[0-9]+$ ]]; then
        echo "Please enter a valid number."
        continue
    fi
 
    (( guess_count++ ))
 
    if (( guess < target )); then
        echo "Higher! Try again."
    elif (( guess > target )); then
        echo "Lower! Try again."
    else
        echo "Congratulations! You guessed the correct number: $target"
 
        # Retrieve the flag from the metadata file
        flag=$(cat /challenge/metadata.json | jq -r '.flag')
        echo "Here's your flag: $flag"
        exit 0  # Exit with success code
    fi
done
 
# Player has exceeded maximum guesses
echo "Sorry, you've exceeded the maximum number of guesses."
exit 1  # Exit with error code to close the connection