password 기간주기

-n This will set the minimum password lifetime, in days, if the
user’s account supports password lifetimes. Available to root
only.

-x This will set the maximum password lifetime, in days, if the
user’s account supports password lifetimes. Available to root
only.

-w This will set the number of days in advance the user will begin
receiving warnings that her password will expire, if the user’s
account supports password lifetimes. Available to root only.

-i This will set the number of days which will pass before an
expired password for this account will be taken to mean that the
account is inactive and should be disabled, if the user’s
account supports password lifetimes. Available to root only.