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ghc-switch manages the installation of multiple versions of ghc and related binaries. Specifically, it:

• Downloads, configures, and installs (if necessary) a pre-built GHC tarball from downloads.haskell.org into ~/.ghc-switch/.
• Downloads, configures, and installs (if necessary) a compatible version of cabal-install from hackage.haskell.org into ~/.ghc-switch/.
• Creates symlinks in ~/.local/bin/ as necessary.

You should use ghc-switch if:

• You don't use stack, which is capable of downloading and installing ghc itself.
• You do use stack, but would still like a convenient way to switch between global ghc installations, or are annoyed by having to stack exec.
• Your OS package manager is insufficient (as on Arch Linux, for example, due to the rolling-release schedule precluding multiple versions of ghc existing simultaneously).

$ ghc-switch 8.2.2
$ ghc --version
The Glorious Glasgow Haskell Compilation System, version 8.2.2
$ cabal --version
cabal-install version 2.0.0.1
compiled using version 2.0.1.0 of the Cabal library

$ ghc-switch 8.0.2
$ ghc --version
The Glorious Glasgow Haskell Compilation System, version 8.0.2
$ cabal --version
cabal-install version 1.24.0.2
compiled using version 1.24.2.0 of the Cabal library