# passwd --help
BusyBox v1.17.2 (2010-09-28 21:52:28 GMT-8) multi-call binary.

Usage: passwd [OPTIONS] [USER]

Change USER's password. If no USER is specified,
changes the password for the current user.

Options:
	-a	Algorithm to use for password (des, md5)
	-d	Delete password for the account
	-l	Lock (disable) account
	-u	Unlock (re-enable) account