MacOS High Sierra无Telnet及MacPorts安装失败解决求助

Hey there, let's sort out this telnet problem on macOS High Sierra. Apple stopped preinstalling telnet ages ago, and it sounds like your MacPorts attempt hit a snag—no worries, here are a few tried-and-true fixes to get you sorted:

Fix 1: Troubleshoot your existing MacPorts setup #

Chances are the issue isn't with telnet itself, but with your MacPorts installation being out of date or missing dependencies. Try these steps:

• First, update MacPorts' port tree to get the latest package info:

  sudo port selfupdate
  

• Clean up any failed installation leftovers that might be blocking things:

  sudo port clean telnet
  

• Now try reinstalling telnet again:

  sudo port install telnet
  

• If you still get errors, make sure you have Xcode Command Line Tools installed—MacPorts needs this to compile packages:

  xcode-select --install
  

  A pop-up will appear; follow the prompts to install it, then retry the telnet install.

Fix 2: Switch to Homebrew (often more reliable for older macOS versions) #

If MacPorts is giving you too much grief, Homebrew is another popular package manager that tends to play nice with High Sierra. Here's how to use it:

• First, confirm Xcode Command Line Tools are installed (use the same xcode-select --install command from above if not).
• Install Homebrew with its official setup command:

  /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
  

• Once Homebrew is set up, install telnet in one line:

  brew install telnet
  

  This should work smoothly—Homebrew handles most dependency issues automatically.

Fix 3: Use the built-in nc (netcat) as a temporary alternative #

If you need to test connections right away and don't want to mess with package managers, macOS has nc (netcat) preinstalled. It can do most of what telnet does for basic port testing. For example:

• To check if a port is open on a host:

  nc -zv example.com 80
  

  This will tell you if the connection succeeds, just like telnet would.

内容的提问来源于stack exchange，提问作者Rui F Ribeiro