Joomla and WP hackers

I am not sure if I am posting this in the correct section, so sorry if it needs to be moved to somewhere else.

I am getting a lot of 404 errors in my logs from vulnerabilty hackers, but these are all for different CMS systems. I would like to know how people handle these. I would like a clean logs file with errors only important to my website.

Is there an easy way to filter out all these 404 errors?

Thanks