*--token* _TOKEN_::
    API token to use when authenticating. This overrides the token stored in
    the credentials file (which is created by man:cargo-login[1]).
+
linkcargo:reference/config.html[Cargo config] environment variables can be
used to override the tokens stored in the credentials file. The token for
crates.io may be specified with the `CARGO_REGISTRY_TOKEN` environment
variable. Tokens for other registries may be specified with environment
variables of the form `CARGO_REGISTRIES_NAME_TOKEN` where `NAME` is the name
of the registry in all capital letters.
