UPDATE：此方法已弃用，不再有效。

此方法导致错误：不支持从GitHub提交URL安装mysql！brew将mysql提取到GitHub上的稳定水龙头。（用法错误）

$ brew install https://raw.githubusercontent.com/Homebrew/homebrew-core/c77882756a832ac1d87e7396c114158e5619016c/Formula/mysql.rb
Updating Homebrew...
==> Auto-updated Homebrew!
Updated 2 taps (homebrew/core and homebrew/cask).

...

Traceback (most recent call last):
    9: from /usr/local/Homebrew/Library/Homebrew/brew.rb:122:in `<main>'
    8: from /usr/local/Homebrew/Library/Homebrew/cmd/install.rb:132:in `install'
    7: from /usr/local/Homebrew/Library/Homebrew/cli/parser.rb:302:in `parse'
    6: from /usr/local/Homebrew/Library/Homebrew/cli/parser.rb:651:in `formulae'
    5: from /usr/local/Homebrew/Library/Homebrew/cli/parser.rb:651:in `map'
    4: from /usr/local/Homebrew/Library/Homebrew/cli/parser.rb:655:in `block in formulae'
    3: from /usr/local/Homebrew/Library/Homebrew/formulary.rb:351:in `factory'
    2: from /usr/local/Homebrew/Library/Homebrew/formulary.rb:138:in `get_formula'
    1: from /usr/local/Homebrew/Library/Homebrew/formulary.rb:142:in `klass'
/usr/local/Homebrew/Library/Homebrew/formulary.rb:227:in `load_file': Invalid usage: Installation of mysql from a GitHub commit URL is unsupported! `brew extract mysql` to a stable tap on GitHub instead. (UsageError)
    12: from /usr/local/Homebrew/Library/Homebrew/brew.rb:155:in `<main>'
    11: from /usr/local/Homebrew/Library/Homebrew/brew.rb:157:in `rescue in <main>'
    10: from /usr/local/Homebrew/Library/Homebrew/help.rb:64:in `help'
     9: from /usr/local/Homebrew/Library/Homebrew/help.rb:83:in `command_help'
     8: from /usr/local/Homebrew/Library/Homebrew/help.rb:103:in `parser_help'
     7: from /usr/local/Homebrew/Library/Homebrew/cli/parser.rb:302:in `parse'
     6: from /usr/local/Homebrew/Library/Homebrew/cli/parser.rb:651:in `formulae'
     5: from /usr/local/Homebrew/Library/Homebrew/cli/parser.rb:651:in `map'
     4: from /usr/local/Homebrew/Library/Homebrew/cli/parser.rb:655:in `block in formulae'
     3: from /usr/local/Homebrew/Library/Homebrew/formulary.rb:351:in `factory'
     2: from /usr/local/Homebrew/Library/Homebrew/formulary.rb:138:in `get_formula'
     1: from /usr/local/Homebrew/Library/Homebrew/formulary.rb:142:in `klass'
/usr/local/Homebrew/Library/Homebrew/formulary.rb:227:in `load_file': Invalid usage: Installation of mysql from a GitHub commit URL is unsupported! `brew extract mysql` to a stable tap on GitHub instead. (UsageError)

我尝试使用推荐的命令进行安装，但它在MySQL 5.7.10的这个特定实例中不起作用。你可能会有更好的运气与更新的公式。

$ brew extract --version=5.7.10 mysql homebrew/cask
==> Searching repository history
==> Writing formula for mysql from revision 0fa511b to:
/usr/local/Homebrew/Library/Taps/homebrew/homebrew-cask/Formula/mysql@5.7.10.rb

$ 

$ brew install /usr/local/Homebrew/Library/Taps/homebrew/homebrew-cask/Formula/mysql@5.7.10.rb
Updating Homebrew...
==> Auto-updated Homebrew!
Updated 1 tap (homebrew/core).
==> Updated Formulae
Updated 1 formula.
Error: undefined method `core_tap?' for nil:NilClass

Error: Failed to load cask: /usr/local/Homebrew/Library/Taps/homebrew/homebrew-cask/Formula/mysql@5.7.10.rb
Cask 'mysql@5.7.10' is unreadable: wrong constant name #<Class:0x00007f9b9498cad8>
Warning: Treating /usr/local/Homebrew/Library/Taps/homebrew/homebrew-cask/Formula/mysql@5.7.10.rb as a formula.
==> Installing mysql@5.7.10 from homebrew/cask
==> Downloading https://homebrew.bintray.com/bottles/cmake-3.19.4.big_sur.bottle.tar.gz
==> Downloading from https://d29vzk4ow07wi7.cloudfront.net/278f2ad1caf664019ff7b4a7fc5493999c06adf503637447af13a617d45cf484?response-content-disposition=attachment%3Bfilenam
######################################################################## 100.0%
==> Downloading https://downloads.sourceforge.net/project/boost/boost/1.59.0/boost_1_59_0.tar.bz2
==> Downloading from https://phoenixnap.dl.sourceforge.net/project/boost/boost/1.59.0/boost_1_59_0.tar.bz2
######################################################################## 100.0%
==> Downloading https://cdn.mysql.com/Downloads/MySQL-5.7/mysql-5.7.10.tar.gz

curl: (22) The requested URL returned error: 404 Not Found
Error: Failed to download resource "mysql@5.7.10"
Download failed: https://cdn.mysql.com/Downloads/MySQL-5.7/mysql-5.7.10.tar.gz

您可以在上面的路径中修改公式（用ruby编写），以尝试实现所需的结果（例如，在最近的macOS版本上安装MySQL 5.7.10）。

您可以使用识别公式和公式历史记录中与您要安装的软件包版本匹配的特定提交的策略。

去https://github.com/Homebrew/homebrew-core按键盘上的t启动文件查找器。确定一个看起来最相关的公式，可能是：formula/mysql.rb，将您带到forumla文件位置：https://github.com/Homebrew/homebrew-core/blob/master/Formula/mysql.rb.单击历史记录按钮查看修订历史记录，该按钮位于https://github.com/Homebrew/homebrew-core/commits/master/Formula/mysql.rb.如果您对MySQL 5.7.10感兴趣，可以单击5.7.11之前的最新版本，该版本导航到GitHub提交：

https://github.com/Homebrew/homebrew-core/commit/c77882756a832ac1d87e7396c114158e5619016c#Formula/mysql.rb

注意：如果提交历史没有加载到浏览器中，您可能需要根据GitHub的建议在控制台中查看提交历史。如果您有兴趣在GitHub上看到提交，请在URL中替换上面的提交SHA。或者，跳到下面的步骤7。

应用提交后，单击“查看”按钮查看mysql.rb文件的源代码。然后单击“原始”按钮查看原始源。复制URL。或者，使用mysql.rb文件名自己构建URL，以标识您的公式和该公式的特定版本（由以下URL中的commmit SHA标识）。

https://raw.githubusercontent.com/Homebrew/homebrew-core/c77882756a832ac1d87e7396c114158e5619016c/Formula/mysql.rb

使用$brew Install[步骤7的URL]安装它$brew安装https://raw.githubusercontent.com/Homebrew/homebrew-core/c77882756a832ac1d87e7396c114158e5619016c/Formula/mysql.rb

基于@tschundee和@Debilski的更新1所描述的工作流，我自动化了该过程，并在此脚本中添加了清理。

下载它，将其放到您的路径中，然后brewv<formula_name><wanted_version>。对于特定OP，它将是：

cd path/to/downloaded/script/
./brewv postgresql 8.4.4

:)

意外升级Postgres？

我的案例：

postgresql意外地从11升级到12（在运行brew升级后没有参数）我想让Postgres保持11岁。

解决方案：

停止数据库：

brew services stop postgresql

安装Postgres 11：

brew install postgresql@11

启用它：

brew link postgresql@11 --force

（可选）将数据库数据目录从postgres重命名为postgres@11:

cd /usr/local/var
ls -lh
mv postgresql@11 postgresql@11-fresh-backup
mv postgres postgresql@11

启动数据库：

brew services start postgresql@11

如果有任何错误，请检查/usr/local/var/log/postgresql@11.log（注意@11）。

对于当前不在默认酿造配方中的版本，您可以使用以下工具轻松创建自己的水龙头：https://github.com/buildtools-version-taps/homebrew-versions-tap-tool

我刚刚使用Homebrew返回到Maven 2.2.1，因为简单的brew安装Maven安装了Maven 3.0.3。

首先你必须把maven目录放在那里

$ brew unlink maven

使用brew tap命令

$ brew tap homebrew/versions
Cloning into '/usr/local/Library/Taps/homebrew-versions'...
remote: Counting objects: 590, done.
remote: Compressing objects: 100% (265/265), done.
remote: Total 590 (delta 362), reused 549 (delta 325)
Receiving objects: 100% (590/590), 117.49 KiB | 79 KiB/s, done.
Resolving deltas: 100% (362/362), done.
Tapped 50 formula

现在，您可以安装maven2公式：

$ brew install maven2
==> Downloading http://www.apache.org/dist/maven/maven-2/2.2.1/binaries/apache-maven-2.2.1-bin.tar.gz
######################################################################## 100.0%
/usr/local/Cellar/maven2/2.2.1: 10 files, 3.1M, built in 6 seconds

$ mvn --version
Apache Maven 2.2.1 (r801777; 2009-08-06 12:16:01-0700)
Java version: 1.6.0_37
Java home: /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home
Default locale: en_US, platform encoding: MacRoman
OS name: "mac os x" version: "10.7.4" arch: "x86_64" Family: "mac" 

编辑：您也可以只编写switch maven 2.2.1来切换到不同的版本。

编辑：Apache Maven项目重组了他们的repo。更新此答案以说明此更改。

brew版本和brew安装https://raw.githubusercontent.com/Homebrew/homebrew-core/现在不支持<COMMIT-HASH>/Formula/<Formula>.rb。

您可以这样尝试：

$ brew extract --version 5.6.2 gradle vitahlin/core
$ brew install gradle@5.6.2