Trying to do fancier things with history I'm clearly not understanding 
something.  Doc says '^' is first word in a history entry and '$' is the 
last. But:

% history -m "^" 1                  # Shows everything
% history -m "^nosuchstring" 1      # Also shows everything
% history -m "$" 1                  # Shows nothing

... so I'm obviously missing something.