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tl;dr - port 22 is between 21 (FTP) and 23 (telnet) and Tatu thought it would give the service clout to have 22. IANA approved his email request and it was registered.

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The body text of the article is only 1273 words. It takes all of a minute to read it.

At which point did the bar for tl:dr become so low?

When it started to take 1273 words to say one sentence of information to attract readers.

When clicking a link to discover just how short an article it is became the norm. So, I'd guess somewhere around the Chips & Dips era.

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