Contract deployment

A simple contract can be deployed using Geth and interacted with using Web3 via the command-line interface (CLI) that geth provides (console or attach). The following are the steps to achieve that. As an example, the following source code will be used:

pragma solidity ^0.4.0;
contract valueChecker
{
    uint price=10;
    event valueEvent(bool returnValue);
    function Matcher (uint8 x) public returns (bool)
    {
        if (x>=price)
        {
            emit valueEvent(true);
            return true;
        }
    }
}

Run the geth client using the following command:

$ geth --datadir ~/etherprivate --networkid 786 --allow-insecure-unlock –rpc --rpcapi "web3,net,eth,debug,personal" --rpccorsdomain https://remix.ethereum.org --debug --vmdebug –nodiscover

or

$ geth --datadir ~/etherprivate --networkid 786 --allow-insecure-unlock --rpc --rpcapi "web3,net,eth,debug" --rpcport 8001 --rpccorsdomain &quot...