On Unix/OSX, the utility is called "tail." However, you will have to find a replacement. Look here for Unix tools for Windows: http://unxutils.sourceforge.net/
As of Qube 6.5, there is a utility in $QBDIR/utils called qbtail.py. This works just as the tail command would on unix/osx, but it does require that Python is installed.
c:\Program Files\pfx\qube\utils>qbtail.py -h
Usage: qbtail.py [options] filename
The qbtail utility displays the contents of file to the standard output.
The display begins at a byte or line location in the input. Numbers are
relative to the end of the input, for example, '-n 2' displays the last two
lines of the input. The default starting location is '-n 10', or the last
10 lines of the input.
Options:
-h, --help show this help message and exit
-c CHARS The location is number bytes.
-n LINES The location is number lines.
-f The -f option causes tail to not stop when end of file is
reached, but rather to wait for additional data to be appended
to the input.
c:\Program Files\pfx\qube\utils>qbtail.py c:\ProgramData\Pfx\Qube\logs\workerlog
[Jan 20, 2014 17:58:36] BRIANKNUDSO15E2[1136]: waiting for udp socket to open up - port: 50011
[Jan 20, 2014 17:58:46] BRIANKNUDSO15E2[1136]: waiting for udp socket to open up - port: 50011
[Jan 20, 2014 17:58:56] BRIANKNUDSO15E2[1136]: waiting for udp socket to open up - port: 50011
[Jan 20, 2014 17:59:06] BRIANKNUDSO15E2[1136]: waiting for udp socket to open up - port: 50011
[Jan 20, 2014 17:59:16] BRIANKNUDSO15E2[1136]: waiting for udp socket to open up - port: 50011
As of WranglerView 6.5, there are also a "View Worker Log" and "View Supervisor Log" options under the Administration menu that will bring up a small subset of the log data stored on disk. The number of lines returned can be managed in WranglerView's preferences.