Which of the following is a geth command in blockchain

Blockchain technology is transforming the world as we know it, and developers are constantly looking for ways to improve their skills and knowledge. One of the essential tools used by blockchain developers is Geth, an open-source Ethereum client that provides a command-line interface (CLI) for interacting with the Ethereum blockchain.

1. Getting Started with Geth

Before diving into the world of Geth commands, it’s essential to understand how to get started with Geth. The first step is to download and install Geth on your computer or laptop. You can do this by visiting the official Geth website and following the installation instructions. Once installed, open a terminal window and navigate to the directory where Geth was installed.

2. Creating a New Wallet

The next step is to create a new wallet in Geth. This is essential for storing your cryptocurrencies and managing your Ethereum transactions. To create a new wallet, open the terminal window and enter the following command:

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geth account new –password

Replace with a secure password that you can remember. Geth will generate a new address for your wallet and prompt you to enter the password to access it.

3. Connecting to the Ethereum Network

Before you can start using Geth commands, you need to connect to the Ethereum network. Geth supports both the mainnet (ETH/ETC) and testnets (e.g., Ropsten, Rinkeby, Goerli). To connect to a testnet, enter the following command:

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geth –network

Replace with the name of the network you want to connect to (e.g., “rinkeby”). Geth will download and sync the blockchain data for the specified network, which may take some time depending on the size of the chain.

4. Listing Accounts

Once you’re connected to the Ethereum network, you can list your accounts by entering the following command:

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geth account list

This will display a list of all your accounts and their balances.

5. Sending Transactions

Sending transactions in Geth is straightforward. To send a transaction, enter the following command:

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geth eth send –to –value

Replace with the Ethereum address of the recipient and with the amount of Ether you want to send. Geth will prompt you to enter your wallet password before confirming the transaction.

6. Querying Blockchain Data

Geth provides a wide range of commands for querying blockchain data, such as the balance of an account, the latest block timestamp, and more. Here are some examples:

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geth eth call "balanceOf(0x") –format "{{{result}}}"

This will display the balance of the specified Ethereum address in Ether.

Another useful command is geth eth log, which displays all events emitted by smart contracts on the blockchain. For example, if you have a smart contract that logs a transaction when it’s executed, you can use the following command to view all log entries:

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geth eth log –filter "eventTransactionLogged" –fromBlock

Replace with the block number of the event you want to view.

7. Debugging Smart Contracts

Debugging smart contracts can be a challenging task, but Geth provides several commands to help you identify and fix errors in your code. The most commonly used command is geth eth trace, which displays a call stack of all functions that have been called by a given address. For example, if you want to see the call stack of all functions called by address 0x123456789, enter the following command:

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geth eth trace –filter "address0x123456789"

This will display a list of all function calls made to the specified address, along with their arguments and return values.

Another useful command is geth eth profiler, which analyzes the performance of your smart contract code by profiling its execution time and resource usage. For example, if you want to profile the execution time of a specific function, enter the following command:

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geth eth profiler –filter "address0x123456789"

Replace with the name of the function you want to profile and