diff --git a/ut/.cat.cr.swp b/ut/.cat.cr.swp
new file mode 100644
index 0000000..c30a11c
--- /dev/null
+++ b/ut/.cat.cr.swp
Binary files differ
diff --git a/ut/cat.cr b/ut/cat.cr
new file mode 100644
index 0000000..bb16e3c
--- /dev/null
+++ b/ut/cat.cr
@@ -0,0 +1,7 @@
+filepath = ARGV[0]
+
+File.open(filepath) do |file|
+  file.each_line do |line|
+    puts line
+  end
+end