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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.

Update (25/11/17): I received a second email from Michael Bazik which details how you can install the telnet client directly from GNU provided tarballs:

Update (05/01/18): Jonny Bradley emailed in to address an issue with installing non homebrew telnet. If you encounter the error:

then you’ll need to chmod ping to allow it permission to run with:

 

Update (08/02/18): Matthew Ward got in touch to say that you can compile telnet without all of the other gunk that still comes with Mac OS, using the following:

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