How to view kernel logs is OS X You can use the command line tool log for this. This command accepts a predicate argument that can be used to , well build predicates, that when evaluates to true, the log message will be printed. It takes a command argument that decides how the logs are to be displayed. For instance log stream produces a streaming output of the log. That is new log messages are displayed as they come (asynchronously). log show displays messages from the log history. log --process 0 displays messages from process with ID 0, which is kernel. This can be used to display all kext log messages. log show --predicate 'processID == 0' displays messages printed by processID 0, which is the kernel process. This is the same as the previous command. To display messages from a driver, you may use the sender predicate filter argument. So if your driver is named mytestdriver , you may display messages from it using the command: log stream --predicate ...
mostly notes & some thoughts...