linux中的diff命令可以比较两个文件的不同，并输出友好的结果，方便查看。其中-y表示输出两列对比，而'--suppress-common-lines'屏蔽了相同的行。
$ diff --suppress-common-lines default.cf osd.4.cf -y name = client.admin | name = osd.4 debug_lockdep = 0/1 | debug_lockdep = 0/0 debug_context = 0/1 | debug_context = 0/0 debug_crush = 1/1 | debug_crush = 0/0 debug_mds = 1/5 | debug_mds = 0/0 debug_mds_balancer = 1/5 | debug_mds_balancer = 0/0 debug_mds_locker = 1/5 | debug_mds_locker = 0/0 debug_mds_log = 1/5 | debug_mds_log = 0/0 debug_mds_log_expire = 1/5 | debug_mds_log_expire = 0/0 debug_mds_migrator = 1/5 | debug_mds_migrator = 0/0 debug_buffer = 0/1 | debug_buffer = 0/0 debug_timer = 0/1 | debug_timer = 0/0 debug_filer = 0/1 | debug_filer = 0/0 debug_objecter = 0/1 | debug_objecter = 0/0 debug_rados = 0/5 | debug_rados = 0/0 debug_rbd = 0/5 | debug_rbd = 0/0 debug_journaler = 0/5 | debug_journaler = 0/0 debug_objectcacher = 0/5 | debug_objectcacher = 0/0 debug_client = 0/5 | debug_client = 0/0 debug_osd = 0/5 | debug_osd = 0/0 debug_optracker = 0/5 | debug_optracker = 0/0 debug_objclass = 0/5 | debug_objclass = 0/0 debug_filestore = 1/3 | debug_filestore = 0/0 debug_journal = 1/3 | debug_journal = 0/0 debug_ms = 0/5 | debug_ms = 0/0 debug_mon = 1/5 | debug_mon = 0/0 debug_monc = 0/10 | debug_monc = 0/0 debug_paxos = 1/5 | debug_paxos = 0/0 debug_tp = 0/5 | debug_tp = 0/0 debug_auth = 1/5 | debug_auth = 0/0 debug_finisher = 1/1 | debug_finisher = 0/0 debug_heartbeatmap = 1/5 | debug_heartbeatmap = 0/0 debug_perfcounter = 1/5 | debug_perfcounter = 0/0 debug_rgw = 1/5 | debug_rgw = 0/0 debug_asok = 1/5 | debug_asok = 0/0 debug_throttle = 1/1 | debug_throttle = 0/0