Usage
*****

In order to interact with a Tezos node, you may use RPC calls through the
client using this command ``tezos-client rpc call <url>``.

For instance, if you wish to request the current balance of a given
block and contract, you can call the associated RPC via the command :
``$ tezos-client rpc call
/blocks/<block_id>/proto/context/contracts/<contract_id>/balance``.

A RPC may takes an *input* and generates an *output* both in JSON
format. For example, the previous RPC call, that does not require an
input, would display on the standard output : ``{ "balance":
"4000000000000" }``. When calling a RPC that requires an input
through command-line, you will be prompted to provide the JSON input
in your default configured text editor.