commander --     (  ),
     woo  hoo.

  commander    .
  ,    . commander 
  stdout   ,   woo  
.      woo,   
 regexp. :
%^/user/.*$$
+^action$$:^update$$
#
  chooser  ,  commander  
      .   
,    .

      convert,   
 woo->hoo.  woo   stdin,  stdout
      hoo.  
 ,    '-'.  
   stderr   woo.

      reverse,  
  hoo->woo.  stdin  
woo,        
,  ,       hoo,
   .   --- 
,        stdout.
  ---   ,   
    stderr.    
     stderr   woo.

