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I tried telnet towel.blinkenlights.nl and it said telnet: command not found. Is it deprecated? It is a bit trivial, but I thought it was worth asking about at least.

marked as duplicate by nohillside Mar 5 '18 at 5:46

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Yes, telnet is deprecated and is not included in High Sierra. If you want it, you’ll have to install it yourself, e.g. using Homebrew. See here for more details.

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