The provided code separates URLs by their extensions, saving them into separate text files.
This is useful for conducting reconnaissance on a large number of websites during penetration testing.
The Python script utilizes regular expressions to identify URL extensions and then creates a dictionary where each unique extension is associated with a list of URLs having that extension.
For each unique extension, the script saves the associated URLs to a separate text file, named after the extension.
The script is configurable with one command line argument, which is the input text file containing all the URLs.
As of this writing, there were slight errors in the original code provided, which have been corrected in this summary.