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  • What are you trying to achieve by changing the permissions? What does not work if you leave the permissions alone? You should not be changing the permissions. Commented Jul 6, 2018 at 21:57
  • I want to read information from an antenna that is connected on the serial port ttyAMA0, the problem is that I am not able to read the information unless I will give read permissions Commented Jul 8, 2018 at 7:00