Add List All Services Managed By Brew as a Brew TIL

brew/list-all-services-managed-by-brew.md

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+# List All Services Managed By Brew
+
+Daemonized services, such as PostgreSQL, can be installed and managed with
+Homebrew. Under the hood `brew` uses `launchctl` on Mac to manage these
+services — i.e. starting, restarting, and stopping them.
+
+Assuming you've already installed some services, you can run `brew services
+list` to see what services there are and what their current status is.
+
+```bash
+$ brew services list
+Name          Status  User       File
+mailhog       none
+mysql         none
+postgresql@11 started jbranchaud ~/Library/LaunchAgents/homebrew.mxcl.postgresql@11.plist
+postgresql@13 none
+postgresql@16 none
+unbound       none
+```
+
+This is the default behavior if you just run `brew services` without a subcommand.
+
+This is helpful if you are, for instance, trying to see which PostgreSQL server
+version you are currently running and which other ones are available to run. I
+might then issue a `stop` to `postgresql@11` so that I can then `start` the
+`postgresql@16` service.
+
+See `brew services --help` for more details.