Update cheatsheets

git-show-index

@@ -0,0 +1,17 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# git show-index
+
+> Show the packed archive index of a Git repository.
+> More information: <https://git-scm.com/docs/git-show-index>.
+
+- Read an IDX file for a Git packfile and dump its contents to `stdout`:
+
+`git show-index {{path/to/file.idx}}`
+
+- Specify the hash algorithm for the index file (experimental):
+
+`git show-index --object-format={{sha1|sha256}} {{path/to/file}}`