Hello. I try to count the unique words in files in one folder and its subfolders.
I tried something like this :

ls| find -d | cat | tr "\ " "\n"| uniq -u | wc -l

but cat writes only the names of the files and not the text which is in them. :-S
Any idea, how to make it?

try: "ls | find ... | xargs cat | ..."

Thank you, this was very helpful.