Wall Street ends with slight gain; indexes post weekly losses

A sharp rally in crude oil and energy shares lifted U.S. stocks on Friday, but indexes registered losses for the week and investors were cautious ahead of earnings season. U.S. crude oil settled more than 6 percent higher after data showed lower U.S. stockpiles, driving gains of 2 percent in the S&P energy index . Investors took their cue again from the oil market and the Federal Reserve, but focus will shift next week to expectedly weak quarterly reports, said Peter Kenny, senior market str