Third-party subcommands

cargo allows the extension of its command-line interface with subcommands. These subcommands are binaries that are called when invoking cargo <command> (for example, cargo clippy for the popular linter).

In order to install a new command (for a particular toolchain), run cargo +nightly install clippy, which will download, compile, and install a crate called cargo-clippy and then put it into the .cargo directory in your home folder. In fact, this will work with any binary that is called cargo-<something> and is executable from any command line. The cargo project keeps an updated list of some useful subcommands in the repository at https://github.com/rust-lang/cargo/wiki/Third-party-cargo-subcommands.