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??: ??diff [-abBcdefHilnNpPqrstTuvwy][-<? ?>][-C <? ?>][-D <??? ??>][-I <?? ?? ??? >] [-S ][-W ][-x ][-X ][--help][--left -column][--suppress -???][?? ?? ???? 1][?? ?? ???? 2]

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[root@localhost test3]# diff log2014.log log2013.log 
3c3< 2014-03---> 2013-038c8< 2013-07---> 2013-0811,12d10< 2013-11< 2013-12

?? "3c3"? "8c8"? log2014.log? log20143log ??? ??? 3?? 8??? ???? ?? ?????. ? ?? ???? ?? ? 11? 12? ????.