Check and enforce password expiration policy
expiry option
The expiry command checks (-c) the current password expiration and forces (-f) changes when required. It is callable as a normal user command.
The options which apply to the expiry command are:
-c, --check
Check the password expiration of the current user.
-f, --force
Force a password change if the current user has an expired password.
-h, --help
Display help message and exit.
/etc/passwd
User account information.
/etc/shadow
Secure user account information.