when I use "geth --dev",I find it already exist a account.But I don't know the password.How can I unlock this account.


The account has a blank password.

$ geth --dev console
> personal.unlockAccount(eth.accounts[0], "");

You can unlock from the command line using a --password password.txt where the file has no contents.

The following commands I executed shows that the eth.accounts[0] is unlocked:

$ touch password.txt
$ geth --dev --password password.txt console
> eth.sendTransaction({from: eth.accounts[0], to: eth.accounts[0], value: web3.toWei(1, "ether")});

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