Add Exclude A File From A Diff Output as a git til

git/exclude-a-file-from-a-diff-output.md

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+# Exclude A File From A Diff Output
+
+When running `git diff <SHA>`, you'll see output for all files changed at that
+commit. It's the same if you do a range of commits (e.g. `git diff
+<SHA1>...<SHA2>`).
+
+If you are looking for changes in a particular part of the tree, then other
+changes will be a distraction. Some generated files, such as `yarn.lock`, can
+create a lot of noise in the diff output.
+
+You can get a more focused output by excluding certain files and paths. The
+syntax for doing that, however, is a bit wonky.
+
+To exclude a file, you have to add an argument formatted like
+`':(exclude)<filename>`.
+
+For instance, to exclude `yarn.lock`:
+
+```bash
+$ git diff <SHA> -- . ':(exclude)yarn.lock'
+```
+
+or to exclude an entire directory:
+
+```bash
+$ git diff <SHA> -- . ':(exclude)spec/**'
+```
+
+[source](https://stackoverflow.com/questions/39931781/git-diff-stat-exclude-certain-files/39937070#39937070)