rustup vs SDKMAN!

rustup installs Rust from its official release channels and manages the toolchains and supporting components developers use. It can switch among stable, beta, and nightly compilers, keep toolchains updated, and install specific versions or dated releases. For cross-compilation, add a target’s standard library with `rustup target add`; Android builds also require the Android NDK and usually a linker. rustup manages official channels, archived releases, alternate hosts, and local builds. It installs command proxies for tools including rustc, rustdoc, Cargo, rust-analyzer, Clippy, and Miri. Component availability varies by release and toolchain, especially for nightly. Installation uses a shell script on Unix and rustup-init.exe on Windows. Downloads use HTTPS, but download signatures are not yet validated. rustup is free and open source, with a free plan. Its listed supported platforms are Linux, macOS, and Windows; the installer also runs on FreeBSD, NetBSD, Solaris, and illumos.

SDKMAN! is a command-line interface and API for managing Software Development Kits in the JVM ecosystem. It supports languages and tools including Java, Scala, Kotlin, Groovy, Ant, Gradle, Grails, Maven, SBT, Spark, Spring Boot, and Vert.x. From the CLI, users can install, uninstall, list, inspect, switch, upgrade, and set default SDK versions. A project can record its versions in an .sdkmanrc file, with automatic switching available when entering its directory. Java distributions are obtained through the Foojay DISCO API. SDKMAN! works on macOS and Linux; Windows use requires WSL or MSYS with MinGW, since it does not run natively there. Cygwin is no longer supported. The installer requires curl, zip, and unzip, and works with Bash and ZSH. Its CI mode answers prompts, disables colored output, and turns off self-updates. SDKMAN! is free, open source, and Apache 2.0 licensed. Security updates are provided only for the latest released CLI version. The project says Go, Rust, Node.js, Python, and Ruby toolchains are outside its intended scope.