Ethereum Cookbook

How to do it...

1. Here is our simple smart contract example:

pragma solidity ^0.4.21;contract HelloWorld {        string public greeting = "Hello World";        function changeGreeting(string _newGreeting) public {        greeting = _newGreeting;    }    }

2. Use solc or other alternatives to compile the contract into ABI and bytecode:

$ solc --optimize --bin --abi HelloWorld.sol

3. Start the geth node with the web3 console:

$ geth console 2>> ./geth.log

4. Make sure that you have enough Ether for deployment. If you are using a private network, make sure to start mining before performing any transactions.
5. Unlock the account from which you want to deploy the contract:

> web3.personal.unlockAccount(web3.eth.accounts[0], "<password>");

6. Create an object of the contract ...