I wanted a quick way to be able to find out what files weren’t visible to others (and therefore, not visible to website visitors). Messing with arguments and the file command, you can do the following:
find -type f ! -perm -444
This locates all files not visible to ‘others’ in the current directory. You can apply this to directories as well:
find -type d ! -perm -111
Hope this helps people like it helped me.