fprintd-list username [usernames...]
fprintd-verify [-f finger] [usename]
fprintd-delete username [usernames...]
The fprintd daemon is accessed through D-Bus by those command-line utilities.
Not that fprintd-list and fprintd-delete require at least one username to be passed, and support multiple usernames.
fprintd-enroll and fprintd-verify will use the current username if none are passed on the command-line.
left-thumb, left-index-finger, left-middle-finger, left-ring-finger, left-little-finger, right-thumb, right-index-finger, right-middle-finger, right-ring-finger, right-little-finger.
The default is automatic, selecting the first available finger for swipe devices, or all the enrolled fingers, for press devices.