Create or change a password associated with a user name. Only the owner or a privileged user may change a password. Owners need not specify their user name. Users can change their own passwords. For all other operations, you must be root.
Delete the password for the user’s account.
Force the operation. Overrides -u.
Display a help message describing the options. See also --usage.
Set the number of days after a password has expired before the account is disabled.
Keep passwords (authentication tokens) that have not expired.
Lock the user’s account.
Set the minimum number of days that the password is valid.
Print the status of the user’s password.
Read new passwords from standard input.
Unlock the user’s account
Display a brief usage message. See also --help.
Set the number of days of warning users will get before their password expires.
Set the maximum number of days that the password is valid.