diff --git a/bin/sumlines b/bin/sumlines
new file mode 100755
index 0000000..81bb1bd
--- /dev/null
+++ b/bin/sumlines
@@ -0,0 +1,3 @@
+#!/usr/bin/env ruby
+
+puts ARGF.each_line.map { |l| l.to_i }.reduce(&:+)