Add Find All Tool Version Files Containing Postgres as a Unix TIL

unix/find-all-tool-version-files-containing-postgres.md

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+# Find All Tool Version Files Containing Postgres
+
+I've been using [`asdf`](https://asdf-vm.com/) for many years now which means I
+have projects and directories all over my machine with `.tool-versions` files.
+Many of them specify Ruby and Node versions. Some of them also include
+PostgreSQL versions. I used to use `asdf` to manage Postgres versions, but no
+longer do that for new or active projects.
+
+I want to find all the places that a `.tool-versions` file declares `postgres`
+as a tool. That way I can begin to clean up the left behind artifacts of
+asdf-managed Postgres.
+
+By combining [`fd`](https://github.com/sharkdp/fd) (a better `find`) and
+[`rg`](https://github.com/BurntSushi/ripgrep) (a better `grep`), I'm able to
+quickly track down the list of places.
+
+```bash
+$ fd --hidden .tool-versions ~/ | xargs rg postgres
+
+/Users/jbranchaud/.local/state/nvim/undo/%Users%jbranchaud%.tool-versions: binary file matches (found "\0" byte around offset 9)
+
+/Users/jbranchaud/code/fake-data/.tool-versions
+2:postgres 13.1
+
+/Users/jbranchaud/code/thirty_days/thirty_days_server/.tool-versions
+1:postgres 13.1
+
+/Users/jbranchaud/code/visualmode/.tool-versions
+1:postgres 11.11
+```
+
+That first instance is a binary file as part of `nvim`'s undo history which I
+can ignore. The other three are good results.
+
+I tell the `fd` command to not exclude hidden files as it looks for all
+occurrences of `.tool-versions` recursively from my home (`~/`) directory. I
+then pipe that list of files to `xargs` which makes those filenames arguments
+to the `rg postgres` command.