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From: Paul Rubin <no.email@nospam.invalid>
Newsgroups: comp.lang.lisp,comp.lang.scheme
Subject: Re: From JoyceUlysses.txt -- words occurring exactly once
Date: Fri, 31 May 2024 00:40:59 -0700
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> could someone give me a pretty fast (and simple) program that'd give
> me a list of all words occurring exactly once?

To first approximation, this works for me (bash command):

  tr -c "[a-zA-Z-]" "\n" < ulysses.txt |sort|uniq -c|sort -n