diff --git a/bin/git-line-summary b/bin/git-line-summary
new file mode 100755
index 0000000..889b403
--- /dev/null
+++ b/bin/git-line-summary
@@ -0,0 +1,58 @@
+#!/bin/bash
+
+project=${PWD##*/}
+
+#
+# list the last modified author for each line 
+#
+function single_file {
+  while read data
+  do
+    git blame --line-porcelain $data | sed -n 's/^author //p'
+  done
+}
+
+#
+# list the author for all file
+#
+function lines {
+  git ls-files | single_file
+}
+
+#
+# count the line count
+#
+function count {
+  lines | wc -l
+}
+
+#
+# sort by author modified lines
+#
+function authors {
+  lines | sort | uniq -c | sort -rn
+}
+
+#
+# list as percentage for author modified lines
+#
+function result {
+  authors | awk '
+    { args[NR] = $0; sum += $0 }
+    END {
+      for (i = 1; i <= NR; ++i) {
+        printf "%-30s %2.1f%%\n", args[i], 100 * args[i] / sum
+      }
+    }
+    '
+}
+
+# summary
+
+echo
+echo " project  : $project"
+echo " lines    :" $(count)
+echo " authors  : "
+result
+echo
+