最近安装 Homebrew 遇到的坑，总结一下。
我的 Mac 版本是 10.13.6。

1. 首先安装 Homebrew

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

• 报错信息:

fatal: unable to access 'https://github.com/Homebrew/brew/': Could not resolve host: github.com

Failed during: git fetch origin master:refs/remotes/origin/master --tags --force

1. 解决方式:
   1. 试着先在终端 ping github.com

   MacBook-Pro:~$     ping github.com
   
     PING github.com (13.250.177.223): 56 data bytes
   
     Request timeout for icmp_seq 0
   
     Request timeout for icmp_seq 1
   
     Request timeout for icmp_seq 2
   
     Request timeout for icmp_seq 3
   
   

   • 如果 ping 出来是这种结果，就接着看第二步
   1. 修改 hosts 配置
      • 在终端中 sudo vi /etc/hosts 打开编辑文件
      • 按 s 进入编辑模式
      • 接着在最下面添加 192.30.253.113 github.com
      • 按 control + c 保存
      • 接着按 :wq 退出，就可以了。
   2. 在终端 ping github.com

      MacBook-Pro:~$     ping github.com
      
      PING github.com (192.30.253.113): 56 data bytes
      
      64 bytes from 192.30.253.113: icmp_seq=0 ttl=49 time=351.766 ms
      
      64 bytes from 192.30.253.113: icmp_seq=1 ttl=49 time=388.017 ms
      
      64 bytes from 192.30.253.113: icmp_seq=2 ttl=49 time=391.047 ms
      
      64 bytes from 192.30.253.113: icmp_seq=3 ttl=49 time=408.031 ms
      
      

   • 就会发现已经成功了。
   1. 接着就在执行

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

   2. 如果安装过程中遇到这种问题

      error: RPC failed; curl 56 LibreSSL SSL_read: SSL_ERROR_SYSCALL, errno 54
      
      fatal: The remote end hung up unexpectedly
      
      

   • 就是网络有问题，在执行一下安装命令

   achang@achangMacBook-Pro:~$     /usr/bin/ruby -e "$(curl -      fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
   
     ==> 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: Counting objects: 106166, done.
   
   remote: Compressing objects: 100% (26/26), done.
   
   remote: Total 106166 (delta 21), reused 27 (delta 14), pack-reused 106125
   
   Receiving objects: 100% (106166/106166), 24.11 MiB | 161.00 KiB/s, done.
   
   Resolving deltas: 100% (77467/77467), done.
   
   From https://github.com/Homebrew/brew
   
   * [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]             1.6.1      -> 1.6.1
   
   * [new tag]             1.6.10     -> 1.6.10
   
   * [new tag]             1.6.11     -> 1.6.11
   
                              ...
   
   * [new tag]             1.6.8      -> 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
   
   HEAD is now at dce6b875c Merge pull request #4581 from reitermarkus/non-existent-download-strategies
   
   ==> Tapping homebrew/core
   
   Cloning into '/usr/local/Homebrew/Library/Taps/homebrew/homebrew-core'...
   
   remote: Counting objects: 4808, done.
   
   remote: Compressing objects: 100% (4590/4590), done.
   
   remote: Total 4808 (delta 57), reused 839 (delta 27), pack-reused 0
   
   Receiving objects: 100% (4808/4808), 3.90 MiB | 14.00 KiB/s, done.
   
   Resolving deltas: 100% (57/57), done.
   
   Tapped 2 commands and 4593 formulae (4,849 files, 12.2MB).
   
   

   • 安装完成了。