Add Show Only Commits That Touch Specific Lines as a git til

git/show-only-commits-that-touch-specific-lines.md

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+# Show Only Commits That Touch Specific Lines
+
+When you run `git log`, you are listing all commits in reverse-chronological
+order for the current branch. There are ways of filtering the commits that
+get output from `git-log`. As of Git 1.8.4, `git-log` output can be filtered
+by commits that touch a range of line numbers.
+
+This is done with the `-L` flag.
+
+For instance, if I want to see all commits that touched the 13th line of my
+`README.md` file, then I can do this:
+
+```bash
+$ git log -L13,13:README.md
+```
+
+I can alter the command to show commits that touched a range of lines like
+so:
+
+```bash
+$ git log -L19,45:README.md
+```
+
+I used the `-L` flag recently to find when a dependency was added to my
+`package.json` file even though the most recent changes to that line were
+version bumps.
+
+[source](https://stackoverflow.com/questions/8435343/retrieve-the-commit-log-for-a-specific-line-in-a-file)