Android Install apk using busybox command-line

I want to install apk silently in android phone, I have found this solution (Link), is how to install apk using busybox command line, but when i tape busybox install path/to/apkfile, it does not work, can someone help me by giving some examples please.

Does Android use BusyBox?

Busybox allows you or programs to perform actions on your phone using Linux (copied from Unix) commands. Android is basically a specialized Linux OS with a Java compatible (Dalvik) machine for running programs.

The command line program that does this is pm: package manager. So try pm install apkfile If you run the command with no arguments it will print out some help text. I don't know how silent it will be - but then you should not be hiding installs from the end user anyway.