diff --git a/commandline.h b/commandline.h
new file mode 100644
index 0000000..39764b4
--- /dev/null
+++ b/commandline.h
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+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * 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.
+ */
+
+#ifndef COMMANDLINE_H
+#define COMMANDLINE_H
+
+#include "adb.h"
+
+int adb_commandline(int argc, const char** argv);
+int usage();
+
+// Connects to the device "shell" service with |command| and prints the
+// resulting output.
+int send_shell_command(TransportType transport_type, const char* serial, const std::string& command,
+                       bool disable_shell_protocol, std::string* output = nullptr,
+                       std::string* err = nullptr);
+
+#endif  // COMMANDLINE_H