diff --git a/lib/InteractiveOptions.ts b/lib/InteractiveOptions.ts
index f48b6ac..c55b5e2 100644
--- a/lib/InteractiveOptions.ts
+++ b/lib/InteractiveOptions.ts
@@ -1,3 +1,5 @@
+/* eslint-disable no-process-exit */
+/* eslint-disable no-console */
 /*
  * Copyright (C) Sapphirecode - All Rights Reserved
  * This file is part of console-app which is released under MIT.
@@ -38,24 +40,40 @@ interface OptionProcess extends Option {
   value?: unknown;
 }
 
+function get_string_type (type: OptionType): 'string'|'number'|'boolean' {
+  if ([
+    'string',
+    'number',
+    'boolean'
+  ].includes (type))
+    return type as ('string'|'number'|'boolean');
+  if ([
+    'file',
+    'folder',
+    'path'
+  ].includes (type))
+    return 'string';
+  throw new Error (`unknown option type ${type}`);
+}
+
 export class InteractiveOptions extends Persistent {
   protected options: Array<OptionProcess>;
+  protected quiet = false;
 
   public constructor (options: Array<Option>) {
     super ();
     this.options = options
       .map ((v) => ({ filled: false, ...v } as OptionProcess));
     for (const option of this.options) {
-      /*
-       *      if (
-       *      typeof option.default !== 'undefined'
-       *      //TODO stringtype    typeof option.default !== option.type
-       *      ) {
-       *      throw new Error (
-       *        `default does not match option type on ${option.name}`
-       *      );
-       *      }
-       */
+      if (
+        typeof option.default !== 'undefined'
+        && typeof option.default !== get_string_type (option.type)
+      ) {
+        throw new Error (
+          `default does not match option type on ${option.name}`
+        );
+      }
+
       this.properties[option.name] = option.type;
     }
   }
@@ -145,18 +163,31 @@ export class InteractiveOptions extends Persistent {
         default:  false,
         type:     'boolean',
         describe: 'do not ask for options interactively'
+      },
+      help: {
+        alias:    'h',
+        default:  false,
+        type:     'boolean',
+        describe: ''
       }
     };
     for (const opt of this.options) {
       yargs_config[opt.name] = {
         alias:    opt.alias,
         default:  opt.default,
-        type:     opt.type === 'boolean' ? 'boolean' : 'string',
+        type:     get_string_type (opt.type),
         describe: opt.description
       };
     }
     const argv = yargs.options (yargs_config)
       .parse ();
+    if (argv.help) {
+      yargs.options (yargs_config)
+        .showHelp ();
+      process.exit (0);
+    }
+    this.quiet = argv.quiet as boolean;
+
     await Promise.all (this.options.map ((opt) => {
       if (typeof argv[opt.name] !== 'undefined')
         return this.assign_arg (opt, argv[opt.name]);
@@ -195,8 +226,23 @@ export class InteractiveOptions extends Persistent {
   }
 
   private async get_interactive_options (): Promise<void> {
-    for (const opt of this.options)
+    if (this.quiet) {
+      const missing = this.options.filter ((o) => !o.filled && o.required)
+        .map ((o) => o.name);
+      if (missing.length > 0) {
+        console.error ('missing arguments:');
+        console.error (missing.join (', '));
+        process.exit (0);
+      }
+    }
+    let invalid = false;
+    for (const opt of this.options) {
       // eslint-disable-next-line no-await-in-loop
       await this.prompt (opt);
+      if (opt.filled === false)
+        invalid = true;
+    }
+    if (invalid)
+      await this.get_interactive_options ();
   }
 }