diff --git a/git_find_exact_file_based_on_hashsum.sh b/git_find_exact_file_based_on_hashsum.sh
new file mode 100755
index 0000000..004bdeb
--- /dev/null
+++ b/git_find_exact_file_based_on_hashsum.sh
@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+# from: https://www.endpoint.com/blog/2014/11/10/finding-specific-git-commit-at-point-in
+
+FILE=$1
+HASH=`git hash-object $FILE`
+echo "Looking for hash $HASH, of file $FILE"
+git rev-list --all \
+  | while read commit
+ do if git ls-tree -r $commit \
+  | grep -F -q $HASH
+ then echo "found in git commit $commit"
+ break
+ fi
+ done