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diff --git a/cmd/cmd.go b/cmd/cmd.go
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+/*
+ * cmd.go - Main interface to cmd package (running, Cmd and Flag structs, etc)
+ *
+ * Copyright 2017 Google Inc.
+ * Author: Joe Richey (joerichey@google.com)
+ *
+ * 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.
+ */
+
+// Package cmd is the common library for writing fscrypt command line binaries.
+// This package is mainly a wrapper around github.com/urfave/cli, but provides
+// additional support to make the usage look similar to the man page.
+//
+// The main componets are the `Cmd` and `Flag` types which can be used to define
+// a top-level command with many potential subcommands. This package also
+// presents a smaller interface than urfave/cli, making it easier to use for
+// other commands.
+package cmd
+
+// Command represents a command with many potential top-level commands. This is
+// trand
+type Cmd struct {
+	Name string
+	UsageLines []string
+	SubCmds []Cmd
+	Arguments []Argument
+	Flags []cli.Flag
+	Man *ManEntry
+	Action CommandFunc
+}
+
+type Argument struct {
+	Name string
+	Usage string
+}
+
+type ManEntry struct {
+	Title string
+	Section int
+}