bash 在 OS X 上找到 brew 的安装位置
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Find the install location of brew on OS X
提问by dwkns
I'm creating a BASH scrip which requires a couple of applications to be installed. ffmpegand sox
我正在创建一个 BASH 脚本，它需要安装几个应用程序。ffmpeg和sox
To ensure they are in place when my script runs I first check for the installation of Homebrew with :
为了确保它们在我的脚本运行时就位，我首先使用以下命令检查 Homebrew 的安装：
#!/bin/bash
which -s brew
if [[ $? != 0 ]] ; then
# Install Homebrew
/usr/bin/ruby -e "$(curl -fsSL https://raw.github.com/Homebrew/homebrew/go/install)"
fi
Then I check that soxand ffmpegare installed with :
然后我检查sox并ffmpeg安装：
echo "---- checking for sox ----"
which -s sox || /usr/local/bin/brew install sox
echo "---- checking for ffmpeg ----"
which -s ffmpeg || /usr/local/bin/brew install ffmpeg
The problem I am facing is when Homebrew is installed but in a non-standard location.
我面临的问题是 Homebrew 已安装但位于非标准位置。
I have to use the full path to Homebrew because this script is being run within Playtypus.
我必须使用 Homebrew 的完整路径，因为此脚本正在Playtypus中运行。
So the question is : How can I reliably get the installed path of Homebrew in a BASH script?
所以问题是：如何在 BASH 脚本中可靠地获取 Homebrew 的安装路径？
回答by dwkns
Answering my own question...
回答我自己的问题...
You can test the output of which brewand deal with things accordingly. To gracefully deal with the case where Homebrew is not installed you can use if which brew 2> /dev/nullwhich redirects stderrto /dev/null.
您可以测试输出which brew并相应地处理事情。为了优雅地处理未安装 Homebrew 的情况，您可以使用if which brew 2> /dev/nullwhich 重定向stderr到/dev/null.
brew --prefixis also useful here as it give the path to where Homebrew installed applications are symlinked to, rather than their actual install path.
brew --prefix在这里也很有用，因为它给出了 Homebrew 安装的应用程序符号链接到的路径，而不是它们的实际安装路径。
A script which works and shows this working :
一个可以工作并显示此工作的脚本：
#!/bin/bash
if which brew 2> /dev/null; then
brewLocation=`which brew`
appLocation=`brew --prefix`
echo "Homebrew is installed in $brewLocation"
echo "Homebrew apps are run from $appLocation"
else
echo "Can't find Homebrew"
echo "To install it open a Terminal window and type :"
echo /usr/bin/ruby -e \"$\(curl\ \-fsSL\ https\:\/\/raw\.github\.com\/Homebrew\/homebrew\/go\/install\)\"
fi
Thanks to Allendarfor the pointers.
感谢Allendar的指点。
回答by FeRD
Just to add to this, Homebrew's --prefixmode has been enhanced here in the far-flung future of 2020 (or maybe it was always this way), so that it now takes a package name as an argument. Meaning locating those "keg-only" packages which aren't linked into standard paths is as easy as:
除此之外，Homebrew 的--prefix模式在 2020 年遥远的未来在这里得到了增强（或者可能一直都是这样），因此它现在将包名称作为参数。这意味着定位那些未链接到标准路径的“仅桶装”包非常简单：
$ brew --prefix ffmpeg
/usr/local/opt/ffmpeg
