diff --git a/bak b/bak
new file mode 100755
index 0000000..5305c49
--- /dev/null
+++ b/bak
@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+
+# Usage:
+# ./bak [-v] [filename] [filename] ...
+
+if [ "$#" -eq 0 ]; then
+  echo "Usage: $0 [filename] [filename]..."
+  exit 1
+fi
+
+if [ "$1" == "-v" ] || [ "$1" == "--version" ]; then
+  echo "what version? this is a tiny little script, sir"
+  exit 0
+fi
+
+if [ "$1" == "-h" ] || [ "$1" == "--help" ]; then
+  echo "Usage: $0 [filename] [filename]..."
+  exit 0
+fi
+
+for file in "$@"; do
+  if [ -f "$file" ]; then
+    cp "$file" "$file.bak"
+    echo "Backed up $file to $file.bak"
+  else
+    echo "file '$file' does not exist"
+  fi
+done