diff --git a/jam b/jam
index c34f042..2cb5a57 100755
--- a/jam
+++ b/jam
@@ -4,6 +4,7 @@ from kivy.app import App
 from kivy.uix.widget import Widget
 from kivy.uix.boxlayout import BoxLayout
 from kivy.config import Config
+import sys
 
 from cross import Cross,Cross_painter
 from status_bar import Status_bar
@@ -14,12 +15,16 @@ class Jam_app(App):
     # name of .kv file for main interface
     kv_file="jam.kv"
 
+    def __init__(self,**kwargs):
+        # the file open for editing
+        self.openfile=kwargs.get("openfile","")
+
+        super(Jam_app,self).__init__()
+
+
     def build(self):
         layout=BoxLayout(orientation="vertical")
 
-        # the file open for editing
-        self.openfile=""
-
         # painter
         self.painter=Cross_painter(self)
         # status bar
@@ -39,6 +44,11 @@ Config.set('input', 'mouse', 'mouse,disable_multitouch')
 # do not exit on escape
 Config.set('kivy', 'exit_on_escape', 0)
 
+# read cli
+openfile=""
+if len(sys.argv)==2:
+    openfile=sys.argv[1]
+
 # run
 if __name__ == '__main__':
-    Jam_app().run()
+    Jam_app(openfile=openfile).run()