Update cheatsheets

ghcup

@@ -0,0 +1,38 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# ghcup
+
+> Haskell toolchain installer.
+> Install, manage, and update Haskell toolchains.
+> More information: <https://gitlab.haskell.org/haskell/ghcup-hs>.
+
+- Start the interactive TUI:
+
+`ghcup tui`
+
+- List available GHC/cabal versions:
+
+`ghcup list`
+
+- Install the recommended GHC version:
+
+`ghcup install ghc`
+
+- Install a specific GHC version:
+
+`ghcup install ghc {{version}}`
+
+- Set the currently "active" GHC version:
+
+`ghcup set ghc {{version}}`
+
+- Install cabal-install:
+
+`ghcup install cabal`
+
+- Update `ghcup` itself:
+
+`ghcup upgrade`