问题描述
我将要编写一个Shell脚本来检测系统中是否安装了几个自制程序包.有没有一种方法可以使用brew命令来实现这一目标?
I'm about to write a shell script to detect if several homebrew packages are installed in the system. Is there a way to use a brew command to achieve that?
我尝试使用brew install <formula> --dry-run
的退出代码.但这会构建缺少的软件包.
I tried using the exit code of brew install <formula> --dry-run
. But this builds the package if it is missing.
推荐答案
您可以使用
brew ls --versions myformula
输出相应公式的已安装版本.如果未安装该公式,则输出将为空.
to output the installed versions of the respective formula. If the formula is not installed, the output will be empty.
使用brew update
可获得的最新版本的自制软件时,只需运行以下命令即可(感谢Slaven):
When using a recent versions of homebrew, which you can get with brew update
, you can just run this (thanks Slaven):
if brew ls --versions myformula > /dev/null; then
# The package is installed
else
# The package is not installed
fi
也就是说,最好检查一下该工具是否存在,而不仅仅是检查各自的自制软件包(例如,通过在$PATH
中搜索可执行文件).人们倾向于在实践中以大量方式安装工具,而自制软件只是其中一种.
That said, it is probably a good idea to check for the existence of the tool at all and not just checking for the respective homebrew package (e.g. by searching for the executable in the $PATH
). People tend to install tools in a rather large amount of ways in practice, with homebrew being just one of them.
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