diff --git a/argument.cpp b/argument.cpp
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index 0000000..099f5ca
--- /dev/null
+++ b/argument.cpp
@@ -0,0 +1,73 @@
+/**
+ * Copyright © 2016 IBM Corporation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "argument.hpp"
+
+#include <algorithm>
+#include <cassert>
+#include <iostream>
+#include <iterator>
+
+namespace phosphor
+{
+namespace led
+{
+// NOLINTNEXTLINE(cppcoreguidelines-avoid-c-arrays)
+ArgumentParser::ArgumentParser(int argc, char* argv[])
+{
+    int option = 0;
+    while (-1 !=
+           (option = getopt_long(argc, argv, optionstr, &options[0], nullptr)))
+    {
+        switch (option)
+        {
+            case '?':
+            case 'h':
+                usage(argv);
+                exit(-1);
+                break;
+            case 'p':
+                arguments["path"] = optarg;
+                break;
+        }
+    }
+}
+
+const std::string& ArgumentParser::operator[](const std::string& opt)
+{
+    static const std::string emptyString{};
+
+    auto i = arguments.find(opt);
+    if (i == arguments.end())
+    {
+        return emptyString;
+    }
+
+    return i->second;
+}
+
+// NOLINTNEXTLINE(cppcoreguidelines-avoid-c-arrays)
+void ArgumentParser::usage(char* argv[])
+{
+    // NOLINTNEXTLINE
+    std::cerr << "Usage: " << argv[0] << " [options]" << std::endl;
+    std::cerr << "Options:" << std::endl;
+    std::cerr << "    --help               Print this menu" << std::endl;
+    std::cerr << "    --path=<path>        absolute path of LED in sysfs; like";
+    std::cerr << " /sys/class/leds/<name>" << std::endl;
+}
+} // namespace led
+} // namespace phosphor