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I had some trouble with my wifi connection so I figured, I could switch on logging for airport via

sudo /System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport debug +AllUserLand +LogFile

Now as far as I remember, the +LogFileshould redirect the airport debug log from kernel.log to wifi.log. Checking Console, I notice that there is no wifi.log under /var/log/. On a closer look, I noticed that kernel.log disappeared as well.

After some googling I found this post, in which it says that kernel.log was merged into system.log. Now if that is true, I'm suspecting that the reason I can't locate wifi.log might be that it was perhaps merged with system.log as well. Does anyone have some further info on this?

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As far as I can tell, all the debug info from airport that used to be in /var/log/wifi.log is now located in /var/log/system.log. Also, the +LogFile option has disappeared. –  altabq Mar 21 '13 at 14:52
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1 Answer

Mountain Lion does log a limited amount of information to

/private/var/log/wifi.log

To read that file – and its siblings such as wifi.log.0.bz2 – use Console.

Included with the operating system is a diagnostics app that can enable debug logging. With that level of logging enabled you can then use Console to:

  • view all messages
  • add a system log query
  • and so on.

Also in Stack Exchange:

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With the latest update, wifi.log appears in Console again. So do a number of other logs that previously disappeared. –  altabq May 21 '13 at 7:52
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