mysql启动失败，求助!!!!!!!

[root@localhost log]# service mysql start
Starting MySQL...The server quit without updating PID file [失败]/mysql/localhost.pid).

161104 12:13:45 mysqld_safe Starting mysqld daemon with databases from /home/mysql
2016-11-04 12:13:45 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details).
2016-11-04 12:13:45 15466 [Note] Plugin 'FEDERATED' is disabled.
2016-11-04 12:13:45 15466 [Note] InnoDB: Using atomics to ref count buffer pool pages
2016-11-04 12:13:45 15466 [Note] InnoDB: The InnoDB memory heap is disabled
2016-11-04 12:13:45 15466 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2016-11-04 12:13:45 15466 [Note] InnoDB: Compressed tables use zlib 1.2.3
2016-11-04 12:13:45 15466 [Note] InnoDB: Using Linux native AIO
2016-11-04 12:13:45 15466 [Note] InnoDB: Using CPU crc32 instructions
2016-11-04 12:13:45 15466 [Note] InnoDB: Initializing buffer pool, size = 128.0M
2016-11-04 12:13:45 15466 [Note] InnoDB: Completed initialization of buffer pool
2016-11-04 12:13:45 15466 [Note] InnoDB: Highest supported file format is Barracuda.
2016-11-04 12:13:45 15466 [Note] InnoDB: 128 rollback segment(s) are active.
2016-11-04 12:13:45 15466 [Note] InnoDB: Waiting for purge to start
2016-11-04 12:13:45 15466 [Note] InnoDB: 5.6.17 started; log sequence number 1600667
2016-11-04 12:13:45 15466 [ERROR] /usr/local/mysql/bin/mysqld: unknown variable 'log-slow-queries=/home/mysql/slowlog/slow_query.log'
2016-11-04 12:13:45 15466 [ERROR] Aborting

2016-11-04 12:13:45 15466 [Note] Binlog end
2016-11-04 12:13:45 15466 [Note] Shutting down plugin 'partition'
2016-11-04 12:13:45 15466 [Note] Shutting down plugin 'ARCHIVE'
2016-11-04 12:13:45 15466 [Note] Shutting down plugin 'BLACKHOLE'
2016-11-04 12:13:45 15466 [Note] Shutting down plugin 'INNODB_SYS_DATAFILES'
2016-11-04 12:13:45 15466 [Note] Shutting down plugin 'INNODB_SYS_TABLESPACES'
2016-11-04 12:13:45 15466 [Note] Shutting down plugin 'INNODB_SYS_FOREIGN_COLS'
2016-11-04 12:13:45 15466 [Note] Shutting down plugin 'INNODB_SYS_FOREIGN'
2016-11-04 12:13:45 15466 [Note] Shutting down plugin 'INNODB_SYS_FIELDS'
2016-11-04 12:13:45 15466 [Note] Shutting down plugin 'INNODB_SYS_COLUMNS'
2016-11-04 12:13:45 15466 [Note] Shutting down plugin 'INNODB_SYS_INDEXES'
2016-11-04 12:13:45 15466 [Note] Shutting down plugin 'INNODB_SYS_TABLESTATS'
2016-11-04 12:13:45 15466 [Note] Shutting down plugin 'INNODB_SYS_TABLES'
2016-11-04 12:13:45 15466 [Note] Shutting down plugin 'INNODB_FT_INDEX_TABLE'
2016-11-04 12:13:45 15466 [Note] Shutting down plugin 'INNODB_FT_INDEX_TABLE'
2016-11-04 12:13:45 15466 [Note] Shutting down plugin 'INNODB_FT_INDEX_CACHE'
2016-11-04 12:13:45 15466 [Note] Shutting down plugin 'INNODB_FT_CONFIG'
2016-11-04 12:13:45 15466 [Note] Shutting down plugin 'INNODB_FT_BEING_DELETED'
2016-11-04 12:13:45 15466 [Note] Shutting down plugin 'INNODB_FT_DELETED'
2016-11-04 12:13:45 15466 [Note] Shutting down plugin 'INNODB_FT_DEFAULT_STOPWORD'
2016-11-04 12:13:45 15466 [Note] Shutting down plugin 'INNODB_METRICS'
2016-11-04 12:13:45 15466 [Note] Shutting down plugin 'INNODB_BUFFER_POOL_STATS'
2016-11-04 12:13:45 15466 [Note] Shutting down plugin 'INNODB_BUFFER_PAGE_LRU'
2016-11-04 12:13:45 15466 [Note] Shutting down plugin 'INNODB_BUFFER_PAGE'
2016-11-04 12:13:45 15466 [Note] Shutting down plugin 'INNODB_CMP_PER_INDEX_RESET'
2016-11-04 12:13:45 15466 [Note] Shutting down plugin 'INNODB_CMP_PER_INDEX'
2016-11-04 12:13:45 15466 [Note] Shutting down plugin 'INNODB_CMPMEM_RESET'
2016-11-04 12:13:45 15466 [Note] Shutting down plugin 'INNODB_CMPMEM'
2016-11-04 12:13:45 15466 [Note] Shutting down plugin 'INNODB_CMP_RESET'
2016-11-04 12:13:45 15466 [Note] Shutting down plugin 'INNODB_CMP'
2016-11-04 12:13:45 15466 [Note] Shutting down plugin 'INNODB_LOCK_WAITS'
2016-11-04 12:13:45 15466 [Note] Shutting down plugin 'INNODB_LOCKS'
2016-11-04 12:13:45 15466 [Note] Shutting down plugin 'INNODB_TRX'
2016-11-04 12:13:45 15466 [Note] Shutting down plugin 'InnoDB'
2016-11-04 12:13:45 15466 [Note] InnoDB: FTS optimize thread exiting.
2016-11-04 12:13:45 15466 [Note] InnoDB: Starting shutdown...
2016-11-04 12:13:47 15466 [Note] InnoDB: Shutdown completed; log sequence number 1600677
2016-11-04 12:13:47 15466 [Note] Shutting down plugin 'PERFORMANCE_SCHEMA'
2016-11-04 12:13:47 15466 [Note] Shutting down plugin 'CSV'
2016-11-04 12:13:47 15466 [Note] Shutting down plugin 'MEMORY'
2016-11-04 12:13:47 15466 [Note] Shutting down plugin 'MRG_MYISAM'
2016-11-04 12:13:47 15466 [Note] Shutting down plugin 'MyISAM'
2016-11-04 12:13:47 15466 [Note] Shutting down plugin 'sha256_password'
2016-11-04 12:13:47 15466 [Note] Shutting down plugin 'mysql_old_password'
2016-11-04 12:13:47 15466 [Note] Shutting down plugin 'mysql_native_password'
2016-11-04 12:13:47 15466 [Note] Shutting down plugin 'binlog'
2016-11-04 12:13:47 15466 [Note] /usr/local/mysql/bin/mysqld: Shutdown complete

大家谁给看看，万分感谢

有没有修改过my.cnf，如果修改过的话变回原样就可以了

my.cnf 修改错误。