Add Interactively Switch asdf Package Versions as a Unix TIL

unix/interactively-switch-asdf-package-versions.md

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+# Interactively Switch asdf Package Versions
+
+I use [`asdf`](https://asdf-vm.com/) to manage versions for a couple different
+languages that I use across projects. I mostly use it for `node` and `ruby`.
+
+When setting up a new project or needing to set the version for an existing
+one, I run some version of:
+
+```bash
+$ asdf local nodejs <some-version-here>
+```
+
+But before I can do that, I need to figure out what versions I have installed
+(`asdf list nodejs`), so I end up running two commands and having to remember
+the nuances of the sub-commands for each.
+
+I decided to make this small interaction easier by making it _interactive_ with
+[`fzf`](https://github.com/junegunn/fzf).
+
+```bash
+asdf local nodejs $(
+  asdf list nodejs | fzf | xargs | sed 's/^\*//'
+)
+```
+
+This grabs the list of installed `nodejs` versions, turns it into an
+interactive list with `fzf`, and then passes my selection to `asdf local` to
+set that version.
+
+I can substitute `ruby` for `nodejs` to do the same thing for Ruby versions.