OPTIONS
-k The option, -k, is used to indicate that the update should only
be for expired authentication tokens (passwords); the user
wishes to keep their non-expired tokens as before.
-l This option is used to lock the specified account and it is
available to root only. The locking is performed by rendering
the encrypted password into an invalid string (by prefixing the
encrypted string with an !).
--stdin
This option is used to indicate that passwd should read the new
password from standard input, which can be a pipe.
-u This is the reverse of the -l option - it will unlock the
account password by removing the ! prefix. This option is avail-
able to root only. By default passwd will refuse to create a
passwordless account (it will not unlock an account that has
only "!" as a password). The force option -f will override this
protection.
-d This is a quick way to disable a password for an account. It
will set the named account passwordless. Available to root only.
-n This will set the minimum password lifetime, in days, if the
userâ
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