diff --git a/README.md b/README.md
index c9c2ccd..400c48c 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ pairing with smart people at Hashrocket.
 
 For a steady stream of TILs, [sign up for my newsletter](https://crafty-builder-6996.ck.page/e169c61186).
 
-_1606 TILs and counting..._
+_1607 TILs and counting..._
 
 See some of the other learning resources I work on:
 - [Ruby Operator Lookup](https://www.visualmode.dev/ruby-operators)
@@ -1539,6 +1539,7 @@ If you've learned something here, support my efforts writing daily TILs by
 - [File Type Info With File](unix/file-type-info-with-file.md)
 - [Find All Files Matching A Name With fd](unix/find-all-files-matching-a-name-with-fd.md)
 - [Find All Files With A Specific Extension With fd](unix/find-all-files-with-a-specific-extension-with-fd.md)
+- [Find All Tool Version Files Containing Postgres](unix/find-all-tool-version-files-containing-postgres.md)
 - [Find Any Dotfiles That Modify Path Env Var](unix/find-any-dotfiles-that-modify-path-env-var.md)
 - [Find A File Installed By Brew](unix/find-a-file-installed-by-brew.md)
 - [Find Duplicate Lines In A File](unix/find-duplicate-lines-in-a-file.md)
diff --git a/unix/find-all-tool-version-files-containing-postgres.md b/unix/find-all-tool-version-files-containing-postgres.md
new file mode 100644
index 0000000..a6e93c7
--- /dev/null
+++ b/unix/find-all-tool-version-files-containing-postgres.md
@@ -0,0 +1,38 @@
+# 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.