diff --git a/python/obitools3/commands/check.pyx b/python/obitools3/commands/check.pyx
new file mode 100644
index 0000000..d72b128
--- /dev/null
+++ b/python/obitools3/commands/check.pyx
@@ -0,0 +1,68 @@
+#cython: language_level=3
+
+from obitools3.dms.dms import DMS       # TODO cimport doesn't work
+from obitools3.dms.view.view import View    # TODO cimport doesn't work
+ 
+ 
+__title__="Print a preview of a DMS, view, column...."
+ 
+default_config = {   'inputview'    : None,
+                 }
+ 
+
+# TODO make it work with URIs
+ 
+def addOptions(parser):
+ 
+    # TODO put this common group somewhere else but I don't know where
+    group=parser.add_argument_group('DMS and view options')
+ 
+    group.add_argument('--default-dms','-d', 
+                       action="store", dest="obi:defaultdms",
+                       metavar='<DMS NAME>',
+                       default=None,
+                       type=str,
+                       help="Name of the default DMS for reading and writing data.")
+ 
+    group.add_argument('--view','-v',
+                       action="store", dest="obi:view",
+                       metavar='<VIEW NAME>',
+                       default=None,
+                       type=str,
+                       help="Name of the view.")
+  
+ 
+#    group=parser.add_argument_group('obi check specific options')
+ 
+#     group.add_argument('--print',
+#                      action="store", dest="less:print",
+#                      metavar='<N>',
+#                      default=None,
+#                      type=int,
+#                      help="Print N sequences (default: 10)")
+ 
+     
+def run(config):
+     
+    # Open DMS
+    d = DMS.open(config['obi']['defaultdms'])
+     
+    # Open input view uif there is one 
+    if config['obi']['inputview'] is not None :
+        iview = View.open(d, config['obi']['inputview'])
+        print(repr(iview))
+    
+    else :
+        for v in d :
+            print(repr(v))
+     
+    d.close()
+     
+     
+     
+ 
+     
+     
+     
+     
+         
\ No newline at end of file