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This article mainly explains "how to use Ethereum-related commands". Friends who are interested may wish to have a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn how to use Ethereum-related commands.

1. If a mapping (uint= > ConfirmDetail) confirmDetails is defined in struct ConfirmOrder, confirmDetails may not be assigned a value when creating ConfirmOrder. If you use ConfirmDetail [] confirmDetails and do not assign a value when creating a ConfirmOrder, an error will be reported: TypeError: Wrong argument count for struct constructor: 5 arguments given but expected 6.

Second, function AddConfirmDetails (uint _ orderId,string _ state) public view returns (uint amount) {, this writing does not show this method. Function AddConfirmDetails (uint _ orderId,string _ state) public {, so write to show this method.

3. Public view returns. If you add view, you cannot insert it. You can insert it without adding view, but you cannot return a value.

4. Query geth version

$geth version

Geth

Version: 1.8.3-stable

Architecture: amd64

Protocol Versions: [63 62]

Network Id: 1

Go Version: go1.10.1

Operating System: darwin

GOPATH=

GOROOT=/usr/local/opt/go/libexec

5. Query go version

$go version

Go version go1.10.1 darwin/amd64

VI. Block chain command

Txpool.status

Miner.start (1); admin.sleepBlocks (5); miner.stop ()

Eth.getBlock (33)

Web3.fromWei (eth.getBalance (eth.accounts [0]), 'ether')

Admin.peers

$geth--testnet-- fast console 2 > > geth-test.log Test Network

$geth--fast console 2 > > geth-test.log main network

Eth.syncing query synchronization progress

Encountered a problem: synchronisation failed retrying block download canceled continues to execute the above statement to synchronize the node after using the following two sentences

$geth removedb

$geth upgradedb

7. The start-up command of multi-node private chain must be consistent, otherwise one node submits the block, and other nodes cannot dig the mine to deal with this block.

such as

Geth-- identity "itari"-- datadir data0-- networkid 899-- port 30303-- rpc-- rpcaddr localhost-- rpcport 8545-- rpcapi "db,web3,eth,personal,miner,net,txpool"-- rpccorsdomain "*" console 2 > > data.log

And

$geth-identity "itari"-datadir data0-networkid 899-port 30303-rpc-rpcaddr localhost-rpcport 8545 console

Two different startup modes

At this point, I believe you have a deeper understanding of "how to use Ethereum-related commands". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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