The log implementation on the stock WP85 distribution uses the
Busybox syslog daemon, and stores the logs to a circular buffer in RAM. Off the top of my head, the RAM buffer is about 200k in size, so as not to fill up the memory of the WP85.
You can get a continuous running display of the log (similar to
tail -f /var/log/kern.log on a Ubunu system) by opening a separate SSH console window and using the command
I did a Legato app some time ago that runs in the background and copies the log to timestamped, hourly files on an external USB flash drive … but I haven’t updated it to use 17.06 yet.