Add List Just The Files Involved In A Commit as a git til

Author: jbranchaud

README.md

@@ -10,7 +10,7 @@ pairing with smart people at Hashrocket.
 
 For a steady stream of TILs, [sign up for my newsletter](https://tinyletter.com/jbranchaud).
 
-_1054 TILs and counting..._
+_1055 TILs and counting..._
 
 ---
 
@@ -253,6 +253,7 @@ _1054 TILs and counting..._
 - [List Commits On A Branch](git/list-commits-on-a-branch.md)
 - [List Different Commits Between Two Branches](git/list-different-commits-between-two-branches.md)
 - [List Filenames Without The Diffs](git/list-filenames-without-the-diffs.md)
+- [List Just The Files Involved In A Commit](git/list-just-the-files-involved-in-a-commit.md)
 - [List Most Git Commands](git/list-most-git-commands.md)
 - [List Untracked Files](git/list-untracked-files.md)
 - [Move The Latest Commit To A New Branch](git/move-the-latest-commit-to-a-new-branch.md)

git/list-just-the-files-involved-in-a-commit.md

@@ -0,0 +1,29 @@
+# List Just The Files Involved In A Commit
+
+As part of a script I was writing I needed a command that could list out all
+the files involved in a given commit. The `git-show` command (which is
+considered a porcelain command) can do this but isn't ideal for scripting. It
+is recommended to instead use _plumbing_ commands.
+
+The `git-diff-tree` command is perfect for listing blobs (files) involved in a
+commit.
+
+```bash
+$ git diff-tree --no-commit-id --name-only -r <SHA>
+```
+
+The `--no-commit-id` flag suppresses the output of the commit id, because we
+want just the files. The `--name-only` flag tells the command to suppress other
+file info and to only show the file names. The `-r` flag tells the command to
+recurse into subtrees so that you get full pathnames instead of just the
+top-level directory.
+
+If you're interested, the `git-show` parallel to this is:
+
+```bash
+$ git show --pretty="" --name-only <SHA>
+```
+
+See `man git-diff-tree` and `man git-show` for more details on these.
+
+[source](https://stackoverflow.com/questions/424071/how-to-list-all-the-files-in-a-commit)