Here’s a bash script that meets the requirements mentioned:

```bash #!/bin/bash

program_password=”mypassword” # Replace with the actual password for the program

Function to prompt for password

prompt_password() { read -s -p “Enter password: “ password echo }

Function to validate password

validate_password() { if [[ “$password” == “$program_password” ]]; then return 0 # Password is correct else return 1 # Password is incorrect fi }

Check if program has a password

if [[ -z “$program_password” ]]; then # No password for the program read -p “No password set for this program. Do you want to run it? (y/n): “ choice if [[ “$choice” == “y” ]]; then # Run the program echo “Running the program…” # Replace the following line with the actual command to run the program ./your_program else echo “Program execution cancelled.” fi else # Program has a password prompt_password if validate_password; then # Password is correct read -p “Password is correct. Do you want to run the program or set a new password? (run/new): “ choice if [[ “$choice” == “run” ]]; then # Run the program echo “Running the program…” # Replace the following line with the actual command to run the program ./your_program elif [[ “$choice” == “new” ]]; then # Prompt for new password read -s -p “Enter new password: “ new_password echo # Update the program password program_password=”$new_password” echo “Password updated successfully.” else echo “Invalid choice.” fi else echo “Incorrect password. Program execution cancelled.” fi fi ```

Make sure to replace ./your_program with the actual command to run your program.