path_helper 沒有從 etc 目錄載入路徑

目前我正在使用 macOS Catalina，但是這對於幾個版本是相同的。

在/etc/zprofile（或/etc/profile在舊版本上使用 bash 時）我預設有這樣的內容：

if [ -x /usr/libexec/path_helper ]; then
   eval `/usr/libexec/path_helper -s`
fi

另外，我在/etc/paths.d/android. 內容是

/Users/$USER/Library/Android/sdk/platform-tools
/Users/$USER/Library/Android/sdk/tools
/Users/$USER/Library/Android/sdk/tools/bin

但是，當我啟動終端時，終端無法在這些文件夾中找到我的二進製文件：

zsh: command not found: adb

不知道為什麼，但解決方法是複制路徑幫助行如下？

if [ -x /usr/libexec/path_helper ]; then
   eval `/usr/libexec/path_helper -s`
   eval `/usr/libexec/path_helper -s`
fi

所以，這是我的問題，為什麼會發生這種情況以及這種解決方法實際上是如何工作的？

我對解決方法感到無聊，因為它只是在每次更新時都被刪除。

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** 編輯 **

沒有重複：

PATH="/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Applications/VMware Fusion.app/Contents/Public:/Users/\$USER/Library/Android/sdk/platform-tools:/Users/\$USER/Library/Android/sdk/tools:/Users/\$USER/Library/Android/sdk/tools/bin:/Users/\$USER/Library/Flutter/bin:/Applications/Wireshark.app/Contents/MacOS:/Users/$USER/Library/Android/sdk/platform-tools:/Users/$USER/Library/Android/sdk/tools:/Users/$USER/Library/Android/sdk/tools/bin:/Users/$USER/Library/Flutter/bin"; export PATH;

print -lr -- $path[@]
/usr/local/bin
/usr/bin
/bin
/usr/sbin
/sbin
/Applications/VMware Fusion.app/Contents/Public
/Users/$USER/Library/Android/sdk/platform-tools
/Users/$USER/Library/Android/sdk/tools
/Users/$USER/Library/Android/sdk/tools/bin
/Users/$USER/Library/Flutter/bin
/Applications/Wireshark.app/Contents/MacOS

有重複：

PATH="/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Applications/VMware Fusion.app/Contents/Public:/Users/\$USER/Library/Android/sdk/platform-tools:/Users/\$USER/Library/Android/sdk/tools:/Users/\$USER/Library/Android/sdk/tools/bin:/Users/\$USER/Library/Flutter/bin:/Applications/Wireshark.app/Contents/MacOS:/Users/$USER/Library/Android/sdk/platform-tools:/Users/$USER/Library/Android/sdk/tools:/Users/$USER/Library/Android/sdk/tools/bin:/Users/$USER/Library/Flutter/bin:/Users/guness/Library/Android/sdk/platform-tools:/Users/guness/Library/Android/sdk/tools:/Users/guness/Library/Android/sdk/tools/bin:/Users/guness/Library/Flutter/bin"; export PATH;

print -lr -- $path[@]
/usr/local/bin
/usr/bin
/bin
/usr/sbin
/sbin
/Applications/VMware Fusion.app/Contents/Public
/Users/$USER/Library/Android/sdk/platform-tools
/Users/$USER/Library/Android/sdk/tools
/Users/$USER/Library/Android/sdk/tools/bin
/Users/$USER/Library/Flutter/bin
/Applications/Wireshark.app/Contents/MacOS
/Users/guness/Library/Android/sdk/platform-tools
/Users/guness/Library/Android/sdk/tools
/Users/guness/Library/Android/sdk/tools/bin
/Users/guness/Library/Flutter/bin

作為一個解決方案，這就是我所做的，我仍然對替代解決方案持開放態度，但在這裡將我的作為參考。

if [ -x /usr/libexec/path_helper ]; then
   paths=`/usr/libexec/path_helper -s`
   eval ${paths//'\$USER'/$'$USER'}
fi

這只是因為第一次path_helper呼叫會生成帶有轉義字元串的路徑變數，如下所示：/Users/\$USER/Library我的解決方法是在評估之前取消轉義。

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不過，感謝**@Gilles ‘SO-stop be evil’**幫助我發現問題。

引用自：https://unix.stackexchange.com/questions/549422