A subset of the available assets can be considered for the calculation by the '--assets' option,
or used to filter the results by the '--show' option.
The argument in both cases is a comma-separated list of assets.

The balances can be carried forward from last year by the '--init' option.
The argument is a comma-separated list of assets, each with its balance and adjusted cost base,
in the form of '<asset>:<balance>[:<acb>],...', such as '--init=BTC:1:5000,ETH:5:1000,LTC:10:80'.