loadwallet "filename"

The loadwallet RPC loads a wallet from a wallet file or directory.

*bitcoin-cli help loadwallet

loadwallet "filename"

Loads a wallet from a wallet file or directory.
Note that all wallet command-line options used when starting bitcoind will be
applied to the new wallet (eg -zapwallettxes, upgradewallet, rescan, etc).

Arguments:
1. "filename"    (string, required) The wallet directory or .dat file.

Result:
{
  "name" :    ,        (string) The wallet name if loaded successfully.
  "warning" : ,            (string) Warning message if wallet was not loaded cleanly.
}

Examples:
> bitcoin-cli loadwallet "test.dat"
> curl --user myusername --data-binary '{"jsonrpc": "1.0", "id":"curltest", "method": "loadwallet", "params": ["test.dat"] }' -H 'content-type: text/plain;' http://127.0.0.1:8332/