mac劍指喪心病狂，連最基本的telnet命令都沒有，沒辦法，那我們就只能自己安裝telnet命令了。
安裝telnet前需要安裝hongbrew，很簡單，複製下面的命令到你的終端工具：
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
此時，在我的電腦上報了一個錯，居然拒絕連接。。
Failed to connect to raw.githubusercontent.com port 443: Connection refused
這時，解決辦法也很簡單，就是配置一個代理，把下面的內容配置到你的host中即可解決。
199.232.28.133 raw.githubusercontent.com
配置完之後，再運行剛纔的命令，效果如下：
Warning: The Ruby Homebrew installer is now deprecated and has been rewritten in
Bash. Please migrate to the following command:
/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"
==> This script will install:
/usr/local/bin/brew
/usr/local/share/doc/homebrew
/usr/local/share/man/man1/brew.1
/usr/local/share/zsh/site-functions/_brew
/usr/local/etc/bash_completion.d/brew
/usr/local/Homebrew
Press RETURN to continue or any other key to abort
==> Downloading and installing Homebrew...
remote: Enumerating objects: 47, done.
remote: Counting objects: 100% (47/47), done.
remote: Compressing objects: 100% (47/47), done.
Receiving objects: 63% (87846/137462), 25.03 MiB | 26.00 KiB/s
好了，等brew安裝完成之後，接着用如下命令安裝telnet就大功告成了。
brew install telnet
大家好，我是灰太狼。那我現在就走吧！ 有幫助？點個贊支持一下。