fprintd-verify

verify a fingerprint against enrolled prints

TLDR

Verify all stored fingerprints for the current user

$ fprintd-verify

Verify a specific fingerprint for the current user

$ fprintd-verify -f [left-thumb|left-index-finger|right-thumb|...]

Verify fingerprints for a specific user

$ fprintd-verify [username]

Verify a specific fingerprint for a specific user

$ fprintd-verify -f [finger_name] [username]

Display help

$ fprintd-verify -h

SYNOPSIS

fprintd-verify [options] [username]

fprintd-verify tests enrolled fingerprints against the fprintd database. It prompts the user to scan their finger and reports whether the scan matches any enrolled fingerprint. It communicates with the fprintd daemon over D-Bus.This is useful for testing fingerprint enrollment quality and troubleshooting authentication issues. Without specifying a finger, the system attempts to match against any enrolled finger.

PARAMETERS

-f, --finger FINGER

Specify which finger to verify: 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

-h, --help

Display help message

CAVEATS

Verification success depends on scan quality and may require multiple attempts. Environmental factors like moisture or dirt on the sensor can affect results. This command is for testing purposes; actual login authentication uses the PAM module pam_fprintd. The fprintd daemon must be running for this command to work.