#!/bin/bash               

window_ids=$(wmctrl -l | cut -f1 -d " ")            
for window_id in $window_ids                        
do                        
  wmctrl -i -r "$window_id" -b toggle,maximized_vert,maximized_horz                                     
  wmctrl -i -r "$window_id" -b add,maximized_vert,maximized_horz                                        
done