Which of the following commands can modify or set the password expiration for a user? (Choose two correct answers.)

The `chage` command (change age) is specifically designed to modify user password aging information, including setting the maximum password age, warning period, and account expiration dates.

`chexpiration` is not a standard Linux command used for managing password expiration.

`shadowconfig` is not a standard Linux command for configuring shadow password settings; `/etc/shadow` is the file, but not a command.

The `passwd` command, primarily used for changing user passwords, can also set password aging parameters such as forcing a password change on the next login or locking/unlocking a user's account.

`userconf` is not a standard Linux command for user or password configuration.