What's Changed:

Help Menu (-h or --help flag): The new script includes a help menu that can be accessed using the -h or --help flag. This provides users with a clear understanding of the script's usage, options, and functionalities.
Output Folder Specification (-o or --output flag): The new script allows users to specify a custom output folder for scan results using the -o or --output flag. This enhances flexibility and organization for users who prefer to manage their scan outputs in a designated location.
Error Handling and Input Validation: The new script incorporates error handling and input validation mechanisms. It checks for the presence of a domain or file input and ensures that collected URLs are valid before proceeding with the scanning process. This improves the script's robustness and prevents potential errors.
Concise and Informative Messages: The new script employs color-coded messages (red and green) to highlight crucial information and enhance readability for users. Additionally, messages are more concise and informative, providing clear status updates throughout the scanning process.

Enhancements:

Code Structure and Readability: The new script likely adheres to best practices for code structure and readability, making it easier for users to understand and potentially modify the script if needed.
Potential Performance Optimizations: While the code snippets provided aren't exhaustive, the use of sort and uro for URL sorting and deduplication suggests potential performance optimizations compared to the older version.
Overall, the new NucleiFuzzer script (v2.1.0) offers a more user-friendly, robust, and informative experience compared to the previous version (v1.0.3).