-.B import-key [NAME[:PORT]]
-Import a pem-encoded ssh secret host key, from stdin. NAME[:PORT] is
-used to specify the hostname (and port) used in the user ID of the new
-OpenPGP key. If NAME is not specified, then the system
-fully-qualified domain name will be used (ie. `hostname -f'). If PORT
-is not specified, the no port is added to the user ID, which means
-port 22 is assumed. `i' may be used in place of `import-key'.