show ports utilization is one of those commands that continually goes back and refreshes its output. Once you hit ESC the table that was output is erased from the screen. It would have been nice to see the last data. Of course, other show ports commands (e.g. show ports configuration) have a "no-refresh" option to output the data only once and then return to the command prompt. But this doesn't work for utilization. This shouldn't be an enormous task to implement.
