importwallet "filename"

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.

*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/