如何在 Mac 上的 $PATH 中添加/usr/local/bin [英] How to add /usr/local/bin in $PATH on Mac

问题描述

当我在终端中打开 .profile"时，我有以下内容:

When I do 'open .profile' in the terminal I have the following:

export PATH=$PATH:/usr/local/git/bin 

现在我为 Mac 安装了 node.js，它说，

Now I installed node.js for Mac and it says,

确保/usr/local/bin 在您的 $PATH 中.

Make sure that /usr/local/bin is in your $PATH.

如何添加/usr/local/bin 导出PATH=$PATH:/usr/local/git/bin?

推荐答案

PATH 变量保存了一个以冒号分隔的目录列表，所以如果你想添加多个目录，只需输入一个它们之间的冒号:

The PATH variable holds a list of directories separated by colons, so if you want to add more than one directory, just put a colon between them:

export PATH=$PATH:/usr/local/git/bin:/usr/local/bin

该语法适用于任何与 Bourne 兼容的 shell(sh、ksh、bash、zsh...).但是 zsh 是最近版本的 MacOS 中的默认 shell，它也以另一种方式公开了 PATH - 作为一个名为(小写)$path 的变量，它是一个数组而不是单个字符串.所以你可以这样做:

That syntax works in any Bourne-compatible shell (sh, ksh, bash, zsh...). But zsh, which is the default shell in recent versions of MacOS, also exposes the PATH another way - as a variable named (lowercase) $path, which is an array instead of a single string. So you can do this instead:

path+=(/usr/local/git/bin /usr/local/bin) 

在任何一种情况下，您都可能需要在添加目录之前检查以确保该目录不在 PATH 中.下面是使用通用语法的样子:

In either case, you may want to check to make sure the directory isn't already in the PATH before adding it. Here's what that looks like using the generic syntax:

for dir in /usr/local/git/bin /usr/local/bin; do
   case "$PATH" in 
     $dir:*|*:$dir:*|*:$dir) :;; # already there, do nothing
     *) PATH=$PATH:$dir          # otherwise add it
   esac
done

这是一个 zsh 特定的版本:

And here's a zsh-specific version:

for dir in /usr/local/git/bin /usr/local/bin; do
  if (( ${path[(i)$dir]} > $#path )); then
    path+=($dir)
  fi
done

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