The result I gave was without 'sudo'. In this way, 'iwlist' immediately describes the access point the system is connected to, and only that access point. With 'sudo', 'iwlist' takes much more time and lists all access points. Also, the "last beacon" times always are much more recent. I therefore believe that only root can force a new scan of the available access points and the time is reset, hence far smaller (less than a second) when the results are returned.

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