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Mac10.13及以上版本安装telnet
目前Mac版本10.13开始，telnet功能成功被苹果阉割，对于网络工程师来说，没有了telnet功能对于问题排查很不方便。
之前接到一个客户反馈的问题，测试映射端口 问题现象如下： 1.测试windows系统，端口telnet正常 2.测试linux及Mac系统，首次失败，第二次开始能够成功
（Mac有相应的网络检测工具，测试端口为正常，与telnet测试冲突）
为了测试相应问题现象，我在mac上进行了telnet操作，错误提示： -bash: telnet: command not found
通过百度，知晓了10.13开始mac的telnet需要手动安装，安装命令如下： brew install telnet 提示： -bash: brew: command not found
就这样出发了前置安装的条件： 安装telnet首先需要安装brew
以下为brew的安装方式：
要等好久，等到花都谢了。。。。。 接下来会弹出输入密码，为mac用户的管理密码
下面为自动下载安装的过程：
==> 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: 26, done. remote: Counting objects: 100% (26/26), done. remote: Compressing objects: 100% (26/26), done. remote: Total 129511 (delta 12), reused 3 (delta 0), pack-reused 129485 Receiving objects: 100% (129511/129511), 30.91 MiB | 175.00 KiB/s, done. Resolving deltas: 100% (95043/95043), done. * [new branch] master -> origin/master * [new tag] 0.1 -> 0.1 * [new tag] 0.2 -> 0.2 * [new tag] 0.3 -> 0.3 * [new tag] 0.4 -> 0.4 * [new tag] 0.5 -> 0.5 * [new tag] 0.6 -> 0.6 * [new tag] 0.7 -> 0.7 * [new tag] 0.7.1 -> 0.7.1 * [new tag] 0.8 -> 0.8 * [new tag] 0.8.1 -> 0.8.1 * [new tag] 0.9 -> 0.9 * [new tag] 0.9.1 -> 0.9.1 * [new tag] 0.9.2 -> 0.9.2 * [new tag] 0.9.3 -> 0.9.3 * [new tag] 0.9.4 -> 0.9.4 * [new tag] 0.9.5 -> 0.9.5 * [new tag] 0.9.8 -> 0.9.8 * [new tag] 0.9.9 -> 0.9.9 * [new tag] 1.0.0 -> 1.0.0 * [new tag] 1.0.1 -> 1.0.1 * [new tag] 1.0.2 -> 1.0.2 * [new tag] 1.0.3 -> 1.0.3 * [new tag] 1.0.4 -> 1.0.4 * [new tag] 1.0.5 -> 1.0.5 * [new tag] 1.0.6 -> 1.0.6 * [new tag] 1.0.7 -> 1.0.7 * [new tag] 1.0.8 -> 1.0.8 * [new tag] 1.0.9 -> 1.0.9 * [new tag] 1.1.0 -> 1.1.0 * [new tag] 1.1.1 -> 1.1.1 * [new tag] 1.1.10 -> 1.1.10 * [new tag] 1.1.11 -> 1.1.11 * [new tag] 1.1.12 -> 1.1.12 * [new tag] 1.1.13 -> 1.1.13 * [new tag] 1.1.2 -> 1.1.2 * [new tag] 1.1.3 -> 1.1.3 * [new tag] 1.1.4 -> 1.1.4 * [new tag] 1.1.5 -> 1.1.5 * [new tag] 1.1.6 -> 1.1.6 * [new tag] 1.1.7 -> 1.1.7 * [new tag] 1.1.8 -> 1.1.8 * [new tag] 1.1.9 -> 1.1.9 * [new tag] 1.2.0 -> 1.2.0 * [new tag] 1.2.1 -> 1.2.1 * [new tag] 1.2.2 -> 1.2.2 * [new tag] 1.2.3 -> 1.2.3 * [new tag] 1.2.4 -> 1.2.4 * [new tag] 1.2.5 -> 1.2.5 * [new tag] 1.2.6 -> 1.2.6 * [new tag] 1.3.0 -> 1.3.0 * [new tag] 1.3.1 -> 1.3.1 * [new tag] 1.3.2 -> 1.3.2 * [new tag] 1.3.3 -> 1.3.3 * [new tag] 1.3.4 -> 1.3.4 * [new tag] 1.3.5 -> 1.3.5 * [new tag] 1.3.6 -> 1.3.6 * [new tag] 1.3.7 -> 1.3.7 * [new tag] 1.3.8 -> 1.3.8 * [new tag] 1.3.9 -> 1.3.9 * [new tag] 1.4.0 -> 1.4.0 * [new tag] 1.4.1 -> 1.4.1 * [new tag] 1.4.2 -> 1.4.2 * [new tag] 1.4.3 -> 1.4.3 * [new tag] 1.5.0 -> 1.5.0 * [new tag] 1.5.1 -> 1.5.1 * [new tag] 1.5.10 -> 1.5.10 * [new tag] 1.5.11 -> 1.5.11 * [new tag] 1.5.12 -> 1.5.12 * [new tag] 1.5.13 -> 1.5.13 * [new tag] 1.5.14 -> 1.5.14 * [new tag] 1.5.2 -> 1.5.2 * [new tag] 1.5.3 -> 1.5.3 * [new tag] 1.5.4 -> 1.5.4 * [new tag] 1.5.5 -> 1.5.5 * [new tag] 1.5.6 -> 1.5.6 * [new tag] 1.5.7 -> 1.5.7 * [new tag] 1.5.8 -> 1.5.8 * [new tag] 1.5.9 -> 1.5.9 * [new tag] 1.6.0 -> 1.6.0 * [new tag] 1.6.1 -> 1.6.1 * [new tag] 1.6.10 -> 1.6.10 * [new tag] 1.6.11 -> 1.6.11 * [new tag] 1.6.12 -> 1.6.12 * [new tag] 1.6.13 -> 1.6.13 * [new tag] 1.6.14 -> 1.6.14 * [new tag] 1.6.15 -> 1.6.15 * [new tag] 1.6.16 -> 1.6.16 * [new tag] 1.6.17 -> 1.6.17 * [new tag] 1.6.2 -> 1.6.2 * [new tag] 1.6.3 -> 1.6.3 * [new tag] 1.6.4 -> 1.6.4 * [new tag] 1.6.5 -> 1.6.5 * [new tag] 1.6.6 -> 1.6.6 * [new tag] 1.6.7 -> 1.6.7 * [new tag] 1.6.8 -> 1.6.8 * [new tag] 1.6.9 -> 1.6.9 * [new tag] 1.7.0 -> 1.7.0 * [new tag] 1.7.1 -> 1.7.1 * [new tag] 1.7.2 -> 1.7.2 * [new tag] 1.7.3 -> 1.7.3 * [new tag] 1.7.4 -> 1.7.4 * [new tag] 1.7.5 -> 1.7.5 * [new tag] 1.7.6 -> 1.7.6 * [new tag] 1.7.7 -> 1.7.7 * [new tag] 1.8.0 -> 1.8.0 * [new tag] 1.8.1 -> 1.8.1 * [new tag] 1.8.2 -> 1.8.2 * [new tag] 1.8.3 -> 1.8.3 * [new tag] 1.8.4 -> 1.8.4 * [new tag] 1.8.5 -> 1.8.5 * [new tag] 1.8.6 -> 1.8.6 * [new tag] 1.9.0 -> 1.9.0 * [new tag] 1.9.1 -> 1.9.1 * [new tag] 1.9.2 -> 1.9.2 * [new tag] 1.9.3 -> 1.9.3 * [new tag] 2.0.0 -> 2.0.0 * [new tag] 2.0.1 -> 2.0.1 * [new tag] 2.0.2 -> 2.0.2 * [new tag] 2.0.3 -> 2.0.3 * [new tag] 2.0.4 -> 2.0.4 * [new tag] 2.0.5 -> 2.0.5 * [new tag] 2.0.6 -> 2.0.6 * [new tag] 2.1.0 -> 2.1.0 * [new tag] 2.1.1 -> 2.1.1 * [new tag] 2.1.10 -> 2.1.10 * [new tag] 2.1.11 -> 2.1.11 * [new tag] 2.1.12 -> 2.1.12 * [new tag] 2.1.13 -> 2.1.13 * [new tag] 2.1.14 -> 2.1.14 * [new tag] 2.1.15 -> 2.1.15 * [new tag] 2.1.16 -> 2.1.16 * [new tag] 2.1.2 -> 2.1.2 * [new tag] 2.1.3 -> 2.1.3 * [new tag] 2.1.4 -> 2.1.4 * [new tag] 2.1.5 -> 2.1.5 * [new tag] 2.1.6 -> 2.1.6 * [new tag] 2.1.7 -> 2.1.7 * [new tag] 2.1.8 -> 2.1.8 * [new tag] 2.1.9 -> 2.1.9 * [new tag] 2.2.0 -> 2.2.0 HEAD is now at 97c575b6c Merge pull request #6807 from scpeters/formula_installer_rescue_already_attempted
curl: (7) Failed to connect to akamai.bintray.com port 443: Operation timed out ######################################################################## 100.0% ==> Pouring portable-ruby-2.6.3.mavericks.bottle.tar.gz ==> Homebrew is run entirely by unpaid volunteers. Please consider donating: ==> Tapping homebrew/core Cloning into '/usr/local/Homebrew/Library/Taps/homebrew/homebrew-core'... remote: Enumerating objects: 5098, done. remote: Counting objects: 100% (5098/5098), done. remote: Compressing objects: 100% (4893/4893), done. remote: Total 5098 (delta 51), reused 318 (delta 9), pack-reused 0 Receiving objects: 100% (5098/5098), 4.14 MiB | 118.00 KiB/s, done. Resolving deltas: 100% (51/51), done. Tapped 2 commands and 4880 formulae (5,140 files, 12.8MB). Already up-to-date. ==> Installation successful!
==> Homebrew has enabled anonymous aggregate formulae and cask analytics. Read the analytics documentation (and how to opt-out) here: https://docs.brew.sh/Analytics
==> Homebrew is run entirely by unpaid volunteers. Please consider donating: ==> Next steps: - Run `brew help` to get started - Further documentation:
截止当前brew及相应组建以成功安装
接下来安装telnet功能： brew install telnet ######################################################################## 100.0% ==> Pouring telnet-60.mojave.bottle.tar.gz | 
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