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I have a private blockchain with two accounts in my genesis.json file and tried to unlock both. I tried multiple methods and all failed. I tried
geth --networkid 42 --datadir "~/data/privateEthereum/client" --nodiscover --rpc --rpcport "8042" --port "30303" --ipcpath "~/Library/Ethereum/geth.ipc" --maxpeers 3 --nat=any --rpccorsdomain "*" --unlock "0 1" --password "password0.txt password1.txt"
Solutions?
At first, you should create a password.txt file of one per line ,and then run this command:
geth --datadir=~/data/privateEthereum/client --unlock "0,1" --password "password.txt" console
For the Ethereum account, there is more infomation here Managing your accounts
