Interactive Use: The Console 交互使用：控制台
attach geth sub-commands. The
console subcommands starts the geth node and then opens the console. The
attach subcommand attaches to the console to an already-running geth instance.
geth console geth attach
Attach mode accepts an endpoint in case the geth node is running with a non default ipc endpoint or you would like to connect over the rpc interface.
geth attach /some/custom/path.ipc geth attach http://126.96.36.199:8545 geth attach ws://188.8.131.52:8546
Note that by default the geth node doesn’t start the HTTP and WebSocket servers and not all functionality is provided over these interfaces for security reasons. These defaults can be overridden with the
--wsapi arguments when the geth node is started, or with admin.startRPC and admin.startWS.
If you need log information, start with:
geth console --verbosity 5 2>> /tmp/eth.log
Otherwise mute your logs, so that it does not pollute your console:
geth console 2> /dev/null
--preload option. This can be used to load often used functions, or to setup web3 contract objects.
geth console --preload "/my/scripts/folder/utils.js,/my/scripts/folder/contracts.js"
Non-interactive Use: Script Mode
attach subcommand accept the
geth attach --exec "eth.blockNumber"
This prints the current block number of a running geth instance.
Or execute a local script with more complex statements on a remote node over http:
geth attach http://geth.example.org:8545 --exec 'loadScript("/tmp/checkbalances.js")' geth attach http://geth.example.org:8545 --jspath "/tmp" --exec 'loadScript("checkbalances.js")'
--jspath <path/to/my/js/root> to set a library directory for your js scripts. Parameters to
loadScript() with no absolute path will be understood relative to this directory.
You can exit the console by typing
exit or simply with
go-ethereum now uses the GoJa JS VM which is compatible with ECMAScript 5.1. There are some limitations though:
- Promises and
web3.js uses the
bignumber.js library. This library is auto-loaded into the console.
In addition to the full functionality of JS (as per ECMA5), the ethereum JSRE is augmented with various timers. It implements
clearTimeout you may be used to using in browser windows. It also provides implementation for
admin.sleep(seconds) and a block based timer,
admin.sleepBlocks(n) which sleeps till the number of new blocks added is equal to or greater than
n, think “wait for n confirmations”.