/ sys / devices / virtual / [ HOME SHELL ] 
Name Size Permission Action
  bdi [ DIR ] drwxr-xr-x  
  block [ DIR ] drwxr-xr-x  
  devlink [ DIR ] drwxr-xr-x  
  dma_heap [ DIR ] drwxr-xr-x  
  dmi [ DIR ] drwxr-xr-x  
  graphics [ DIR ] drwxr-xr-x  
  input [ DIR ] drwxr-xr-x  
  mem [ DIR ] drwxr-xr-x  
  misc [ DIR ] drwxr-xr-x  
  msr [ DIR ] drwxr-xr-x  
  net [ DIR ] drwxr-xr-x  
  powercap [ DIR ] drwxr-xr-x  
  ppp [ DIR ] drwxr-xr-x  
  sound [ DIR ] drwxr-xr-x  
  thermal [ DIR ] drwxr-xr-x  
  tty [ DIR ] drwxr-xr-x  
  vc [ DIR ] drwxr-xr-x  
  vtconsole [ DIR ] drwxr-xr-x  
  workqueue [ DIR ] drwxr-xr-x  

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Change Permission : bdi