rustup-doc

Open the offline Rust documentation for the current toolchain.

Open the main page

$ rustup doc

Open the documentation for a specific topic (a module in the standard library, a type, a keyword, etc.)

$ rustup doc [std::fs|usize|fn|...]

Open the Rust Programming Language book

$ rustup doc --book

Open the Cargo book

$ rustup doc --cargo

Open the Rust Reference

$ rustup doc --reference