How to inventory unique file types within a directory

[remarkableearth]

My directory tree has thousands of images of dozens of file types, some of which exiftool can read/write/create and some it cannot.

I'd like to take an inventory of the unique file types within the directory and all its subdirectories. I've searched this forum and a general google search for "exiftool inventory file types" and "exiftool survey file types" and the only thing I found which seems promising is -listf. I'll keep looking and trying things, but in the meantime, can you help?

[StarGeek]

Does it need to specifically be file types that exiftool can read or all types available?  Do some of the files have incorrect extensions?

I think this might be better handled outside of exiftool.  For example, this SuperUser answer has a BAT file for Windows.  I also see unix type answers as well.  As long as you don't need to inspect each file to make sure of the filetype, this seems like a quicker and more efficient answer.

[remarkableearth]

Indeed, StartGeek.

As you were responding, I found this script on StackOverflow that does the job: find . -type f | perl -ne 'print $1 if m/\.([^.\/]+)$/' | sort -u, found here: https://stackoverflow.com/questions/1842254/how-can-i-find-all-of-the-distinct-file-extensions-in-a-folder-hierarchy. As you said, more easily accomplished outside of exiftool.

Thank you.

[StarGeek]

Yep, I found that one as well, but wasn't sure what OS you were using.  Since I'm on Windows, I decided to test out the Windows version.  That one is not very fast when run on a very large (100,000+ files) directory.