brew：如何删除软件包的过时版本

自制酒会自我升级以酿造啤酒。维护者似乎尚未实现某些日常使用的命令，例如brew cleanup。

因此，有人知道如何自动删除过时的软件吗？

$ brew
Example usage:
  brew search [TEXT|/REGEX/]
  brew (info|home|options) [FORMULA...]
  brew install FORMULA...
  brew update
  brew upgrade [FORMULA...]
  brew uninstall FORMULA...
  brew list [FORMULA...]

Troubleshooting:
  brew config
  brew doctor
  brew install -vd FORMULA

Brewing:
  brew create [URL [--no-fetch]]
  brew edit [FORMULA...]
  https://github.com/Homebrew/brew/blob/master/share/doc/homebrew/Formula-Cookbook.md

Further help:
  man brew
  brew help [COMMAND]
  brew home

您想要的命令cleanup-运行brew cleanup将删除磁盘上但不再安装的软件包。

> brew help cleanup
brew cleanup [--prune=days] [--dry-run] [-s] [formulae]:
    For all installed or specific formulae, remove any older versions from the
    cellar. In addition, old downloads from the Homebrew download-cache are deleted.

    If --prune=days is specified, remove all cache files older than days.

    If --dry-run or -n is passed, show what would be removed, but do not
    actually remove anything.

    If -s is passed, scrubs the cache, removing downloads for even the latest
    versions of formulae. Note downloads for any installed formulae will still not be
    deleted. If you want to delete those too: rm -rf $(brew --cache)

例如：

> brew cleanup
Removing: /usr/local/Cellar/awscli/1.10.19... (2,955 files, 22.3M)
Removing: /usr/local/Cellar/git/2.8.2... (1,418 files, 30.5M)
Removing: /usr/local/Cellar/imagemagick/6.9.3-7... (1,459 files, 17.9M)
Removing: /usr/local/Cellar/libgcrypt/1.7.0... (17 files, 1.5M)
Removing: /usr/local/Cellar/libgpg-error/1.21... (19 files, 419.4K)
Removing: /usr/local/Cellar/libksba/1.3.3... (13 files, 343K)
Removing: /usr/local/Cellar/mercurial/3.7.3... (386 files, 4.7M)
Removing: /usr/local/Cellar/node/6.0.0... (3,655 files, 38.8M)
Removing: /usr/local/Cellar/openssl/1.0.2g... (1,678 files, 12.0M)
Removing: /usr/local/Cellar/vim/7.4.1795... (1,687 files, 22.6M)
Removing: /Library/Caches/Homebrew/git-2.8.2.el_capitan.bottle.tar.gz... (11.2M)
Removing: /Library/Caches/Homebrew/imagemagick-6.9.3-7.el_capitan.bottle.tar.gz... (7M)
Removing: /Library/Caches/Homebrew/libgcrypt-1.7.0.el_capitan.bottle.tar.gz... (565.4K)
Removing: /Library/Caches/Homebrew/libgpg-error-1.21.el_capitan.bottle.tar.gz... (130.8K)
Removing: /Library/Caches/Homebrew/libksba-1.3.3.el_capitan.bottle.tar.gz... (126.6K)
Removing: /Library/Caches/Homebrew/node-6.0.0.el_capitan.bottle.tar.gz... (10.9M)
Removing: /Library/Caches/Homebrew/openssl-1.0.2g.el_capitan.bottle.tar.gz... (3.6M)
Removing: /Library/Caches/Homebrew/vim-7.4.1795.tar.gz... (12.0M)
==> This operation has freed approximately 196.4M of disk space.

我有一个周一上午的疗程：

brew update
brew upgrade
brew cleanup

这使我了解了Homebrew的最新信息，然后安装了所有已安装的Brew，然后通过删除不再引用的旧Brew释放了磁盘空间。对于需要保持特定版本的啤酒，我将它们保持在brew pin那里，因此我仍然可以运行此简单的三个命令链来更新固定包装周围的所有其他内容。

这不是答案，但是评论太久了，这是我用来保持酿造最新状态的代码：

    fullBrewUpdate(){
            brew update
            brew cask update

            casks=( $(brew cask list) )

            for cask in ${casks[@]}
            do
                # in the first line there is version
                    current="$(brew cask info $cask | sed -n '1p' | sed -n 's/^.*: \(.*\)$/\1/p')"

                    installed=( $(ls /opt/homebrew-cask/Caskroom/$cask))
                    if (! [[ " ${installed[@]} " == *" $current "* ]]); then
                            (set -x; brew cask install $cask --force;)
                    fi
            done

            brew upgrade
            brew cleanup
    }

我将其保存在我的~/.bash_profile手机中，因此可以从Terminal即时调用它作为函数名称。