diff --git a/netutils_linux_hardware/cli.py b/netutils_linux_hardware/cli.py
index b54b6fb..0cc7cbf 100644
--- a/netutils_linux_hardware/cli.py
+++ b/netutils_linux_hardware/cli.py
@@ -16,39 +16,44 @@ class ServerInfo(object):
     subsystems = ('cpu', 'memory', 'net', 'disk', 'system')
 
     def __init__(self):
+        self.parser = argparse.ArgumentParser()
         self.__parse_args()
         self.__check_args()
         self.main()
 
     def __parse_args(self):
         default_directory = '/tmp/netutils_server_info/'
-        parser = argparse.ArgumentParser()
-        parser.add_argument('--directory', type=str, help="Specify a data directory or a tarball",
-                            default=default_directory)
-        parser.add_argument('--collect', action='store_true', help='Collect the data about the server', default=False)
-        parser.add_argument('--gzip', action='store_true', help="Compress the data", default=False)
-        parser.add_argument('--show', action='store_true', help='Shows data about the server in YAML', default=False)
-        parser.add_argument('--rate', action='store_true', help='Rates data about the server', default=False)
-        parser.add_argument('-f', '--folding', action='count', help='-f - device, -ff - subsystem, -fff - server',
-                            default=FOLDING_NO)
-        parser.add_argument('--device', action='store_const', const=FOLDING_DEVICE, dest='folding',
-                            help='Folds rates details to entire devices')
-        parser.add_argument('--subsystem', action='store_const', const=FOLDING_SUBSYSTEM, dest='folding',
-                            help='Folds rates details to entire subsystems')
-        parser.add_argument('--server', action='store_const', const=FOLDING_SERVER, dest='folding',
-                            help='Folds rates details to entire server')
-        parser.add_argument('--cpu', action='store_true', help='Show information about CPU', default=False)
-        parser.add_argument('--memory', action='store_true', help='Show information about RAM', default=False)
-        parser.add_argument('--net', action='store_true', help='Show information about network devices', default=False)
-        parser.add_argument('--disk', action='store_true', help='Show information about disks', default=False)
-        parser.add_argument('--system', action='store_true', help='Show information about system overall (rate only)',
-                            default=False)
-        self.args = parser.parse_args()
+        self.parser.add_argument('--directory', type=str, help="Specify a data directory or a tarball",
+                                 default=default_directory)
+        self.parser.add_argument('--collect', action='store_true', help='Collect the data about the server',
+                                 default=False)
+        self.parser.add_argument('--gzip', action='store_true', help="Compress the data", default=False)
+        self.parser.add_argument('--show', action='store_true', help='Shows data about the server in YAML',
+                                 default=False)
+        self.parser.add_argument('--rate', action='store_true', help='Rates data about the server', default=False)
+        self.parser.add_argument('-f', '--folding', action='count', help='-f - device, -ff - subsystem, -fff - server',
+                                 default=FOLDING_NO)
+        self.parser.add_argument('--device', action='store_const', const=FOLDING_DEVICE, dest='folding',
+                                 help='Folds rates details to entire devices')
+        self.parser.add_argument('--subsystem', action='store_const', const=FOLDING_SUBSYSTEM, dest='folding',
+                                 help='Folds rates details to entire subsystems')
+        self.parser.add_argument('--server', action='store_const', const=FOLDING_SERVER, dest='folding',
+                                 help='Folds rates details to entire server')
+        self.parser.add_argument('--cpu', action='store_true', help='Show information about CPU', default=False)
+        self.parser.add_argument('--memory', action='store_true', help='Show information about RAM', default=False)
+        self.parser.add_argument('--net', action='store_true', help='Show information about network devices',
+                                 default=False)
+        self.parser.add_argument('--disk', action='store_true', help='Show information about disks', default=False)
+        self.parser.add_argument('--system', action='store_true',
+                                 help='Show information about system overall (rate only)', default=False)
+        self.args = self.parser.parse_args()
 
     def __check_args(self):
         """ Maybe they should be positional arguments, not options. But subparsers/groups are stupid """
-        assert any([self.args.collect, self.args.rate, self.args.show]), "Specify command: {0}".format(self.commands)
-
+        if not any([self.args.collect, self.args.rate, self.args.show]):
+            print('Error: please, specify --rate, --show or --collect command')
+            self.parser.print_help()
+            exit(1)
         if not any(getattr(self.args, subsystem) for subsystem in self.subsystems):
             for subsystem in self.subsystems:
                 setattr(self.args, subsystem, True)
diff --git a/setup.py b/setup.py
index 2e7983d..1e29dff 100644
--- a/setup.py
+++ b/setup.py
@@ -16,7 +16,7 @@ def read(*paths):
 
 setuptools.setup(
     name='netutils-linux',
-    version='2.7.2',
+    version='2.7.3',
     author='Oleg Strizhechenko',
     author_email='oleg.strizhechenko@gmail.com',
     license='MIT',