BusyBox v1.27.2 (Debian 1:1.27.2-2) multi-call binary.
BusyBox is copyrighted by many authors between 1998-2015.
Licensed under GPLv2. See source distribution for detailed
copyright notices.

Usage: busybox [function [arguments]...]
   or: busybox --list[-full]
   or: busybox --install [-s] [DIR]
   or: function [arguments]...

  BusyBox is a multi-call binary that combines many common Unix
  utilities into a single executable.  Most people will create a
  link to busybox for each function they wish to use and BusyBox
  will act like whatever it was invoked as.

Currently defined functions:（略）