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In our previous article (How to Create an Account on a Local Private Ethereum Blockchain), we discussed how to create an account on a local private Ethereum network.
In this article, we learn what Ethereum Optional Flags are and how to use them.
While we were building a local private blockchain, we used a few command-line options such as --datadir, --identity, --verbosity, and so on. These options are also known as optional flags. They are Ethereum options and are useful for setting up a local blockchain and accessing testnets. Developer chain options support switching to developer mode.
Other options are available for Ethash, transaction pools, performance tuning, account, API and consoles, networking, miner, gas price oracles, virtual machines, logging and debugging, metrics, stats, and options, and so on. Let's have a look at the following command:
$ geth help or $ geth h
The preceding command will give you a full host of Ethash options. Let's have a look at the format of the following command:
$ geth [options] command [command options] [arguments]
You can implement all the options in the commands using the preceding format.
Geth comes with a list of commands and command-line options. Earlier, you saw a few in action, including console, account, attach, and so on. The following is a list of commands that are supported by Geth:
We used geth account new to create new accounts in the previous section. Furthermore, geth account helps you manage accounts:
$ geth account list - gives you a summary of existing accounts $ geth account update - updates the existing accounts $ geth account import - imports private keys for new accountsSome additional geth commands are as follows:
For example, a presale Ethereum wallet can be imported with the following import command:
$ geth wallet import <path to wallet>presale.wallet
There are other commands that are useful for monitoring your local chain and testing, including dump, dumpconfig, export-preimages, import-preimages, license, makecache, makedag, monitor, and version.
In our next article (Review of Ethereum Options for Development and Testing), we discuss what Ethereum Options are for application development and testing.
This article is written in collaboration with Brian Wu who is a leading author of “Learn Ethereum: Build your own decentralized applications with Ethereum and smart contracts” book. He has written 7 books on blockchain development.
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