command search path的意思|示意

Is there a way to search for this using a command? Or is its path always default to where it gets installed?

有没有一种办法来搜索使用一个命令吗？或是它的路径总是默认安装的地方了吗？

The compiler will look for it in a predefined set of locations, which can be modified by setting a search path environment variable or through a command line option.

编译器将会在预定义的位置集查找该头文件，这些预定义的位置可以通过设置查找路径环境变量或者通过命令行选项来修改。