mysql可执行文件可能不存在于您的路径中，因此当您尝试从任何CLI执行时都不会找到。

The mysql executable is likely not present in your path, so will not be found when you try to execute from any CLI.

按照说明这里，调整你安装的mysql版本。

Follow the instructions here, adjusting for the version of mysql you have installed.