diff --git a/generate.go b/generate.go
new file mode 100644
index 0000000..31c9155
--- /dev/null
+++ b/generate.go
@@ -0,0 +1,11 @@
+/*******************************************************************************
+* Copyright 2022 Stefan Majewsky <majewsky@gmx.net>
+* SPDX-License-Identifier: GPL-3.0-only
+* Refer to the file "LICENSE" for details.
+*******************************************************************************/
+
+package main
+
+func Generate(scan ScanResult) {
+	fail("unimplemented")
+}
diff --git a/main.go b/main.go
index 75c8b40..1ab8c63 100644
--- a/main.go
+++ b/main.go
@@ -9,9 +9,21 @@ package main
 import (
 	"fmt"
 	"os"
+	"path/filepath"
 )
 
 func main() {
+	if len(os.Args) != 2 {
+		usage(1)
+	}
+	switch os.Args[1] {
+	case "upload":
+		Upload(Scan())
+	case "generate":
+		Generate(Scan())
+	case "help", "--help":
+		usage(0)
+	}
 	scanResult := Scan()
 	fmt.Printf("%#v", scanResult)
 }
@@ -29,3 +41,14 @@ func fail(msg string, args ...interface{}) {
 	fmt.Fprintln(os.Stderr, "ERROR: ", msg)
 	os.Exit(1)
 }
+
+func usage(exitCode int) {
+	fmt.Fprintf(os.Stderr,
+		"Usage:\n\n"+
+			"  %[1]s upload   - Upload all relevant files for one episode to <sftp://ftp.c3d2.de>.\n"+
+			"  %[1]s generate - Generate the c3d2-web news entry XML file for one episode.\n\n"+
+			"All relevant files (audios, chapter marks file, shownotes Markdown file) must be in the working directory.\n",
+		filepath.Base(os.Args[0]),
+	)
+	os.Exit(exitCode)
+}
diff --git a/scan.go b/scan.go
index 40421ce..016f181 100644
--- a/scan.go
+++ b/scan.go
@@ -21,7 +21,7 @@ type ScanResult struct {
 	Month int
 	Year  int
 	//files discovered
-	AudioFormats []string
+	AudioFileNames []string
 	//parts extracted from the shownotes
 	Title       string
 	Description string
@@ -71,16 +71,11 @@ func Scan() (result ScanResult) {
 
 	//collect audio files
 	pattern := fmt.Sprintf("pentaradio-%04d-%02d-%02d.*", result.Year, result.Month, result.Day)
-	names, err = filepath.Glob(pattern)
+	result.AudioFileNames, err = filepath.Glob(pattern)
 	must(err)
 	if len(names) == 0 {
 		fail("no files found: %s", pattern)
 	}
-	for _, name := range names {
-		result.AudioFormats = append(result.AudioFormats, strings.TrimPrefix(filepath.Ext(name), "."))
-	}
-
-	//TODO: parse chapter marks
 
 	return
 }
diff --git a/upload.go b/upload.go
new file mode 100644
index 0000000..5f1c322
--- /dev/null
+++ b/upload.go
@@ -0,0 +1,11 @@
+/*******************************************************************************
+* Copyright 2022 Stefan Majewsky <majewsky@gmx.net>
+* SPDX-License-Identifier: GPL-3.0-only
+* Refer to the file "LICENSE" for details.
+*******************************************************************************/
+
+package main
+
+func Upload(scan ScanResult) {
+	fail("unimplemented")
+}