diff --git a/main.py b/main.py
index 3b8d68b..0c324aa 100644
--- a/main.py
+++ b/main.py
@@ -13,6 +13,31 @@ import json
 import datetime
 import sys
 
+HELP_MESSAGE = """
+Provisionning script from re2o.
+
+python3 main.py [--help]
+                [--force] [--upgrade] [--limit <switchs>]
+
+    --help
+        Print this message
+    --force
+        Force rewrite the switch config. If not applied, the script only reconfigure the switchs that
+        re2o indicate as needing regeneration.
+    --upgrade
+        Upgrade the switch config
+    --limit <switchs>
+        Limit the scripts to the given list of switchs.
+        the list of switchs is a coma separated list of switch short name, whitout spaces.
+        exp: python3 --force --limit sw-ga-1,sw-ga-2
+
+"""
+
+# Yes, it's uggly, but we don't need to load all the mess bellow for just an help message.
+if "--help" in sys.argv:
+    print(HELP_MESSAGE)
+    exit()
+
 config = ConfigParser()
 config.read('config.ini')
 
@@ -237,35 +262,42 @@ class Switch:
 
         post_reboot = requests.post(url_reboot, data=json.dumps(data), headers=self.headers)
 
-
-if "--force" in sys.argv:
-    sw = Switch()
-    for switch in all_switchs:
-        sw.switch = switch
-        sw.gen_conf_and_write()
-        try:
-            sw.apply_conf()
-        except:
-            print("Erreur dans l'application de la conf pour " + switch["short_name"])
-
-if "--upgrade" in sys.argv:
-    sw = Switch()
-    for switch in all_switchs:
-        sw.switch = switch
-        sw.upgrade()
-
-
-for service in api_client.list("services/regen/"):
-    if service['hostname'] == client_hostname and \
-        service['service_name'] == 'switchs' and \
-        service['need_regen']:
-        error = False
-        sw=Switch()
-        for switch in all_switchs:
-            sw.switch = switch
-            sw.gen_conf_and_write()
-            try:
-                sw.apply_conf()
-            except:
-                error = True
-        api_client.patch(service['api_url'], data={'need_regen': error})
+if "--limit" in sys.argv:
+    list_index = sys.argv.index("--limit") + 1
+    if len(sys.argv) >= list_index:
+        raise RuntimeError("--limit must be followeb by a comma separated list of switch")
+
+#if "--force" in sys.argv:
+#    sw = Switch()
+#    for switch in all_switchs:
+#        sw.switch = switch
+#        sw.gen_conf_and_write()
+#        try:
+#            sw.apply_conf()
+#        except:
+#            print("Erreur dans l'application de la conf pour " + switch["short_name"])
+#
+#if "--upgrade" in sys.argv:
+#    sw = Switch()
+#    for switch in all_switchs:
+#        sw.switch = switch
+#        sw.upgrade()
+#
+#
+#for service in api_client.list("services/regen/"):
+#    if service['hostname'] == client_hostname and \
+#        service['service_name'] == 'switchs' and \
+#        service['need_regen']:
+#        error = False
+#        sw=Switch()
+#        for switch in all_switchs:
+#            sw.switch = switch
+#            sw.gen_conf_and_write()
+#            try:
+#                sw.apply_conf()
+#            except:
+#                error = True
+#        api_client.patch(service['api_url'], data={'need_regen': error})
+
+for switch in all_switchs:
+    print(switch['short_name'])