function userName = getusername
%GETUSERNAME  Get user name.
%		USERNAME = GETUSERNAME returns the login name of the current MATLAB 
%		user. Function should work for both Linux and Windows.
%
%		Markus Buehren
%		Last modified: 20.04.2008
%
%		See also GETHOSTNAME.

persistent userNamePersistent

if isempty(userNamePersistent)
	if ispc
		userName = getenv('username');
	else
		systemCall = 'whoami';
		[status, userName] = system(systemCall); %#ok
		if status ~= 0
			error('System call ''%s'' failed with return code %d.', systemCall, status);
	end
		userName = userName(1:end-1);
end

	% save string for next function call
	userNamePersistent = userName;
else
	% return string computed before
	userName = userNamePersistent;
end