The importwallet RPC imports private keys from a file in wallet dump file format (see the `dumpwallet` RPC). These keys will be added to the keys currently in the wallet. This call may need to rescan all or parts of the block chain for transactions affecting the newly-added keys, which may take several minutes.
importwallet "filename"
*bitcoin-cli help importwallet
importwallet "filename" Imports keys from a wallet dump file (see dumpwallet). Requires a new wallet backup to include imported keys. Arguments: 1. "filename" (string, required) The wallet file Examples: Dump the wallet > bitcoin-cli dumpwallet "test" Import the wallet > bitcoin-cli importwallet "test" Import using the json rpc call > curl --user myusername --data-binary '{"jsonrpc": "1.0", "id":"curltest", "method": "importwallet", "params": ["test"] }' -H 'content-type: text/plain;' http://127.0.0.1:8332/