add examples to the usage

scripts/logview

@@ -18,7 +18,16 @@ def date_cheat(datestr):
 
 def parse_args(args):
     usage = """
-          show_changed [options] [-d datestr] [-p playbook]
+          logview [options] [-d datestr] [-p playbook]
+          
+          examples:
+          logview -d yesterday -l # lists playbooks run on that date
+          
+          logview -s OK -s FAILED -d yesterday # list events from yesterday that failed or were ok
+          
+          logview -s CHANGED -d yesterday -p mirrorlist # list events that changed from the mirrorlist playbook
+          
+          
           """
     parser = OptionParser(usage=usage)
     parser.add_option("-d", default='today', dest='datestr', help="time string of when you want logs")