How to switch between Rust toolchains?

Question

rustup help toolchain lists the following sub-commands

SUBCOMMANDS:
    list         List installed too         


        

Answer 1

Use rustup default to change the default toolchain. You can use the full name (e.g. rustup default stable-x86_64-unknown-linux-gnu) or a short alias (e.g. rustup default stable).

rustup also has methods to override the default in a more scoped manner. See Override precedence in rustup's README.