systemd-tty-ask-password-agent − List or process pending systemd password requests
systemd−tty−ask−password−agent [OPTIONS...] [VARIABLE=VALUE...]
systemd−tty−ask−password−agent is a password agent that handles password requests of the system, for example for hard disk encryption passwords or SSL certificate passwords that need to be queried at boot−time or during runtime.
systemd−tty−ask−password−agent implements the Password Agents Specification  .
The following options are understood:
Lists all currently pending system password requests.
Process all currently pending system password requests by querying the user on the calling TTY.
Continuously process password requests.
Forward password requests to wall(1) instead of querying the user on the calling TTY.
Ask question with plymouth(8) instead of querying the user on the calling TTY.
Ask question on /dev/console instead of querying the user on the calling TTY.
Print a short help text and exit.
Print a short version string and exit.
On success, 0 is returned, a non−zero failure code otherwise.
systemd(1), systemctl(1), systemd-ask-password-console.service(8), wall(1), plymouth(8)
Password Agents Specification