当在OS X上的Terminal.app中打开BASH shell时，PATH env变量是如何设置的？

Question

什么启动脚本 - 它们被调用的顺序 - 在OS X上的Terminal.app中打开BASH shell时设置变量PATH？

Answer 1

我发现了罪魁祸首。秘密酱油是/usr/libexec/path_helper它看起来在文件/etc/paths和目录/etc/paths.d/。

首先bash源/etc/profile它执行以下代码：

if [ -x /usr/libexec/path_helper ]; then 
    eval `/usr/libexec/path_helper -s` 
    # The above line is the secret sauce, so to say... 
    # First is adds default PATH values from the file /etc/paths 
    # Then all files in the /etc/paths.d/ directory are read and directories listed 
    # in each file (one per line) are appended to PATH 
fi 

if [ "${BASH-no}" != "no" ]; then 
    [ -r /etc/bashrc ] && . /etc/bashrc 
fi 

下一页bash查找~/.bash_profile，~/.bash_login，和~/.profile。

清单这些步骤进行，PATH构建如下：文件/etc/paths在

1. 目录添加到PATH在目录中的文件中列出
2. 目录/etc/paths.d/是附加到PATH - 注，这些被附加与预先附加。
3. 我~/.bash_profile和~/.bashrc文件的各种PATH={DIR_2_ADD}:"${PATH}"语句前面加上PATH