Rust CLI Troubleshooting: rustup, Toolchains, Components, and Targets

rustup show

# Display installed toolchains and the active default.

rustup default stable

# Choose the global channel to use by default.

cargo +stable test

# Use a channel explicitly for one command.

rustup override set stable

# Set a local override for the current project.

rustup which rustc

# Show the actual executable path selected by rustup.

rustup component list

# See whether rustfmt, clippy, or docs are installed.

rustup component add clippy

# Add the Clippy lint component to the active toolchain.

rustup component add rustfmt

# Add the formatter component to the active toolchain.

rustup target list --installed

# Show available target triples already added locally.

rustup target add x86_64-unknown-linux-musl

# Add support for a cross-compilation target.

cargo build --target x86_64-unknown-linux-musl

# Compile using an installed target triple.