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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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The (short) story of how the SSH port became 22. (www.ssh.com)

submitted 7 months ago* (last edited 7 months ago) by [email protected] to c/[email protected]

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cross-posted from: https://programming.dev/post/9907720

The SSH port is 22. This is the story of how it got that port number. And practical configuration instructions.

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[–] [email protected] 12 points 7 months ago

At a guess, it's because the function of preserving file dates and times is more likely than setting the port to something other than the default, so it gets the lowercase character, whereas ssh doesn't do anything with files so the port option gets the lowercase character.

The inconsistency is annoying though. I wonder if they could make ssh's -p option case insensitive so -P works across the board. (Maybe -P is reserved for some unknown future purpose?)

A work-around would be introducing long options and having --port be the option's long name across all the commands, but then, that comes with its own problems.