--bip39 read a classic BIP39 seed and passphrase from the terminal instead of asking for lnd seed format or providing the --rootkey flag
-h, --help help for showrootkey
--rootkey string BIP32 HD root key of the wallet to use for decrypting the backup; leave empty to prompt for lnd 24 word aezeed
--walletdb string read the seed/master root key to use fro decrypting the backup from an lnd wallet.db file instead of asking for a seed or providing the --rootkey flag