--- a/pvl/backup/invoke.py	Tue Feb 14 21:51:30 2012 +0200
+++ b/pvl/backup/invoke.py	Tue Feb 14 22:16:06 2012 +0200
@@ -26,7 +26,7 @@
         Returns stdout.
     """
     
-    log.debug("cmd={cmd}, args={args}".format(cmd=cmd, args=args))
+    log.debug("{cmd} {args}".format(cmd=cmd, args=' '.join(args)))
 
     if data is False :
         # keep process stdin/out