gnupg: GPGSM EXPORT
5.6.7 Export certificates
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To export certificate from the internal key database the command:
EXPORT [--data [--armor] [--base64]] [--] PATTERN
is used. To allow multiple patterns (which are ORed) quoting is
required: Spaces are to be translated into "+" or into "%20"; in turn
this requires that the usual escape quoting rules are done.
If the '--data' option has not been given, the format of the output
depends on what was set with the 'OUTPUT' command. When using PEM
encoding a few informational lines are prepended.
If the '--data' has been given, a target set via 'OUTPUT' is ignored
and the data is returned inline using standard 'D'-lines. This avoids
the need for an extra file descriptor. In this case the options
'--armor' and '--base64' may be used in the same way as with the
'OUTPUT' command.