问题1和2的答案是:必须先设置PATH变量，或者在启用FEATURE_PREFER_APPLETS的情况下编译busybox.您可以通过以下方式设置PATH变量:

The answer to questions 1 and 2 is: you must set your PATH variable first or compile busybox with FEATURE_PREFER_APPLETS enabled. You can set the PATH variable with:

$ export PATH=/bin:/sbin:/usr/bin:/usr/sbin

busybox applet是一个小型应用程序，通常在UNIX通用实用程序(在POSIX标准中定义)中找到.该小程序被编译为单个可执行文件:busybox.

A busybox applet is a small application that is usually found in the UNIX common utilities (defined in the POSIX standard). This applets are compiled into a single executable: busybox.