geth --datadir private_network --nodiscover console
> var bin = "0x608060405234801561001057600080fd5b50610209806100206000396000f3fe608060405234801561001057600080fd5
b506004361061004c5760003560e01c806306661abd14610051578063371303c01461006f5780636d4ce63c14610079578063b3bcfa82146
10097575b600080fd5b6100596100a1565b60405161006691906100ff565b60405180910390f35b6100776100a7565b005b6100816100c25
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"
undefined
> var abi = [{"inputs":[],"name":"count","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"dec","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"get","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"inc","outputs":[],"stateMutability":"nonpayable","type":"function"}]
undefined
> var contract = eth.contract(abi)
undefined
> var myContract = contract.new({ from: eth.accounts[0], data: bin})
Error: authentication needed: password or unlock
        at web3.js:6365:37(47)
        at send (web3.js:5099:62(35))
        at web3.js:3021:48(124)
        at <eval>:1:30(13)
> personal.unlockAccount(eth.accounts[0])
Unlock account 0xd78f9a659a9a7b50689eb2bd4c4aebdc9c2e5312
Passphrase:
true
> var myContract = contract.new({ from: eth.accounts[0], data: bin})
undefined