我什么时候应该为新货物使用 --bin 选项？

Question

What is the difference between cargo new <project_name> --bin and cargo new <project_name> ?

It seems both commands make exactly the same project; all components are consistent.

I think --bin stands for "binary", but I don't know when to use this option or not.

Answer 1

There is no difference between cargo new and cargo new --bin . From First Steps with Cargo , emphasis mine:

To start a new package with Cargo, use cargo new :

 $ cargo new hello_world

Cargo defaults to --bin to make a binary program . To make a library, we would pass --lib , instead.

Likewise, Cargo's command line help tells you the same thing. From cargo new --help , with some irrelevant lines removed:

% cargo new --help
OPTIONS:
        --bin                      Use a binary (application) template [default]
        --lib                      Use a library template

See also

• Why does `cargo new` create a binary instead of a library?
• What is the difference between library crates and normal crates in Rust?