Add Override The Global Git Ignore File as a Git TIL

git/override-the-global-git-ignore-file.md

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+# Override The Global Git Ignore File
+
+One of the places that `git` looks when deciding whether to pay attention to or
+ignore a file is in your global _ignore_ file. By default, `git` will look for
+this file at `$XDG_CONFIG_HOME/git/ignore` or `$HOME/.config/git/ignore`.
+
+I don't have `$XDG_CONFIG_HOME` set on my machine, so it will fall back to the
+config directory under `$HOME`.
+
+I may have to create the `git` directory and `ignore` file.
+
+```bash
+$ mkdir $HOME/.config/git
+$ touch $HOME/.config/git/ignore
+```
+
+Then I can add file and directories to exclude to that `ignore` file just like
+I would any other `.gitignore` file.
+
+If I'd prefer for the global _ignore_ file to live somewhere else, I can
+specify that location and filename in my `$HOME/.gitconfig` file.
+
+```
+[core]
+	excludesFile = ~/.gitignore
+```
+
+Setting this will override the default, meaning the default file mentioned
+above will be ignored ("now you know how it feels, ignore file!"). In this
+case, I'll need to create the `.gitignore` file in my home directory and add
+any of my ignore rules.
+
+[source](https://git-scm.com/docs/gitignore)