Geth Linux介绍

Geth是一款以太坊客户端，它能够与以太坊网络进行交互，并且可以用于部署和运行智能合约。

在Linux平台上，我们可以使用以下命令来安装和运行Geth：

安装Geth

在Linux上安装Geth非常简单，我们可以使用包管理工具来完成安装，例如在Ubuntu上使用apt-get命令：

sudo apt-get update
sudo apt-get install ethereum

运行Geth

安装完成后，我们可以通过以下命令来启动Geth：

geth --syncmode "fast" --cache=1024 console

命令参数说明：

• --syncmode "fast"：设置同步模式为快速同步模式。
• --cache=1024：设置缓存大小为1024 MB。
• console：启动Geth的JavaScript控制台。

在控制台中，我们可以通过JavaScript代码与以太坊进行交互，查询区块链信息，部署和运行智能合约等。

Geth JavaScript API

以下是一些常用的Geth JavaScript API：

eth.getBlock()

获取最新的区块信息：

> eth.getBlock("latest")
{
  difficulty: 1127072749735362,
  extraData: "0x",
  gasLimit: 5000,
  gasUsed: 0,
  hash: "0xe381a960637926b4e3ed081db78ac6de4fe06236f6874f178d5ea445b827013e",
  logsBloom: "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
  miner: "0x0000000000000000000000000000000000000000",
  mixHash: "0x0000000000000000000000000000000000000000000000000000000000000000",
  nonce: "0x0000000000000000",
  number: 13081839,
  parentHash: "0x0c160aa3b10b6f78a1e2c86c0f52e08c93683c16adf76b0ab4cba37a7c6dc33a",
  receiptsRoot: "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e36350a5",
  sha3Uncles: "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
  size: 555,
  stateRoot: "0xc9ecabd4c7bf4fa9decc7f1d257c91b4c05d20ee7c0af302b78a728c89c32085",
  timestamp: 1648348595,
  totalDifficulty: 14706402069028026389620,
  transactions: [],
  transactionsRoot: "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e36350a5",
  uncles: []
}

eth.getBlockNumber()

获取最新的区块高度：

> eth.getBlockNumber()
13081840

eth.getTransaction()

获取交易信息：

> eth.getTransaction("0x58b0892a71053c29e05c4ad8da764b5ac3ad43167ec081d9f8fbf4e60ab06320")
{
  blockHash: "0xa3501f91a6400d1c683c5e392a2d6472b5e0fb5737562dc67599a0107d0d2c41",
  blockNumber: 13081751,
  from: "0x4c5f400298e06ca969af1151932564e04c862178",
  gas: 21000,
  gasPrice: 50000000000,
  hash: "0x58b0892a71053c29e05c4ad8da764b5ac3ad43167ec081d9f8fbf4e60ab06320",
  input: "0x",
  nonce: 105,
  r: "0x57e4a77115e5cee4e17a0f592339a9db63dc8d6e4628aa755931eec4c2469f3d",
  s: "0x5a70c43d19b6687f793188345ee56f2d7c04feefa4a1dca2a3a9d8ead308cb22",
  to: "0xfFfFffC8Ddd8b8E774444bA8F16Bf9c4d6Bf0760",
  transactionIndex: 0,
  v: "0x1c",
  value: 1000000000000000000
}

eth.sendTransaction()

发送一笔以太币交易：

> eth.sendTransaction({from: '0x4c5f400298e06ca969af1151932564e04c862178', to: '0x2b55',
    value: web3.toWei(1, "ether"), gasPrice: web3.toWei(4, "gwei")})

"0x5d2f734ad2d7f9a0d357d5e71f372d5c73ec67ba22d651f527ca870e11444938"

更多Geth JavaScript API请参考Geth官方文档。