2

In order to know last block hash in bitcoin I can just call

bitcoin-cli getbestblockhash

from command line.

Is there something like that in ethereum or I should use RPC and curl?

1

When your node is running, you can use:

 geth --exec 'eth.getBlock(eth.blockNumber).hash' attach

If it is not running, then there is no way to be synchronized, so you cannot get this information.

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