We may be able to determine the issue for the repetitive logging errors if you could provide some more context surrounding that period of time. i.e. Get the logs previous to the error starting to occur and paste them in here as well.
As far as viewing the logs in realtime without starting Wowza in standalone mode (i.e. starting in service mode), you might be looking for the tail command. Please try something like the following:
# tail -f [path-to-wowza]/logs/[log-file-to-view].log
tail -f /usr/local/WowzaStreamingEngine/logs/wowzastreamingengine_access.log