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Restore Telnet in Mac OS High Sierra 10.13

Telnet has been removed from Mac OS High Sierra, but can still be useful for developers to check ports are open etc.

If you need to enable it, you can do so with Homebrew:

Update (10/10/17): I received an email from David Waitzman in which he notes you can get telnet from an old Time Machine backup and then copy it into /usr/local/bin – I’d recommend that options too if you have a backup.

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