gnupg: Scdaemon LEARN
6.6.2 Read all useful information from the card
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LEARN [--force]
Learn all useful information of the currently inserted card. When
used without the '--force' option, the command might do an INQUIRE like
this:
INQUIRE KNOWNCARDP <hexstring_with_serialNumber>
The client should just send an 'END' if the processing should go on
or a 'CANCEL' to force the function to terminate with a cancel error
message. The response of this command is a list of status lines
formatted as this:
S KEYPAIRINFO HEXSTRING_WITH_KEYGRIP HEXSTRING_WITH_ID
If there is no certificate yet stored on the card a single "X" is
returned in HEXSTRING_WITH_KEYGRIP.