参考：
https://www.jianshu.com/p/4bca68d843b2
https://stackoverflow.com/questions/38618885/error-rpc-failed-curl-transfer-closed-with-outstanding-read-data-remaining
https://juejin.im/post/5d503ebef265da03cf7a7f48
直接执行命令：
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
首次可能会出现问题：
Cloning into 'large-repository'...
remote: Counting objects: 20248, done.
remote: Compressing objects: 100% (10204/10204), done.
error: RPC failed; curl 18 transfer closed with outstanding read data remaining
fatal: The remote end hung up unexpectedly
fatal: early EOF
fatal: index-pack failed
可以执行 git config --global http.postBuffer 524288000 命令解决；
中间会有 homebrew-core 下载失败的情况，可以执行下面命令直接下载，速度会比较慢。
$ git clone https://github.com/Homebrew/homebrew-core /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core
然后会出现如下，表示成功
Press RETURN to continue or any other key to abort
==> Downloading and installing Homebrew...
HEAD is now at 3b78b1aa9 Merge pull request #7369 from dawidd6/automerge-multiple-labels
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
No analytics data has been sent yet (or will be during this `install` run).
==> Homebrew is run entirely by unpaid volunteers. Please consider donating:
https://github.com/Homebrew/brew#donations
==> Next steps:
- Run `brew help` to get started
- Further documentation:
https://docs.brew.sh
最后就可以安装其他的更新了
$ brew install unrar
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