/ sys / class / mem / [ HOME SHELL ] 
Name Size Permission Action
  full [ DIR ] drwxr-xr-x  
  kmsg [ DIR ] drwxr-xr-x  
  mem [ DIR ] drwxr-xr-x  
  null [ DIR ] drwxr-xr-x  
  oldmem [ DIR ] drwxr-xr-x  
  port [ DIR ] drwxr-xr-x  
  random [ DIR ] drwxr-xr-x  
  urandom [ DIR ] drwxr-xr-x  
  zero [ DIR ] drwxr-xr-x  

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Change Permission : port