Add Include Ignore Files In Ripgrep Search as a Unix TIL

unix/include-ignore-files-in-ripgrep-search.md

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+# Include Ignore Files In Ripgrep Search
+
+By default, [ripgrep (`rg`)](https://github.com/BurntSushi/ripgrep) will look
+for and respect _ignore_ files like `.gitignore`. Any file and directory marked
+by those ignore files will no be included in an `rg` search.
+
+This is usually what you want. Sometimes, however, it can be useful to get
+results from this ignored files as well.
+
+In order to ignore your ignore files, pass the `--no-ignore` flag to `rg`:
+
+```bash
+$ rg --no-ignore ENV_VAR_KEY
+```
+
+Something to keep in mind is that `rg` also ignores _hidden_ files and
+directories (those things that are prefixed with a `.`, such as `.env` or
+`.config/`). If some of your ignored files are also _hidden_ files, then they
+still won't show up in search. You'll need the `--hidden` flag as well.
+
+```bash
+$ rg --no-ignore --hidden ENV_VAR_KEY
+```
+
+A shorthand equivalent for that is `-uu`:
+
+```bash
+$ rg -uu ENV_VAR_KEY
+```
+
+See `man rg` for more details.