Add Grep For A Pattern On Another Branch as a git til

git/grep-for-a-pattern-on-another-branch.md

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+# Grep For A Pattern On Another Branch
+
+Git has a built-in `grep` command that works essentially the same as the
+standard `grep` command that unix users are used to. The benefit of
+`git-grep` is that it is tightly integrated with Git.
+You can search for occurrences of a pattern on another branch. For example,
+if you have a feature branch, `my-feature`,  on which you'd like to search
+for occurrences of `user.last_name`, then your command would look like this:
+
+```bash
+$ git grep 'user\.last_name' my-feature
+```
+
+If there are matching results, they follow this format:
+
+```
+my-feature:app/views/users/show.html.erb:  <%= user.last_name %>
+...
+```
+
+This formatting is handy because you can easily copy the branch and file
+directive for use with [`git-show`](viewing-a-file-on-another-branch.md).
+
+See `man git-grep` for more details.