mysql 如何启用InnoDB引擎？

如题：
mysql> show engines;
+------------+----------+----------------------------------------------------------------+
| Engine | Support | Comment |
+------------+----------+----------------------------------------------------------------+
| MyISAM | DEFAULT | Default engine as of MySQL 3.23 with great performance | 
| MEMORY | YES | Hash based, stored in memory, useful for temporary tables | 
| InnoDB | DISABLED | Supports transactions, row-level locking, and foreign keys | 
| BerkeleyDB | YES | Supports transactions and page-level locking | 
| BLACKHOLE | NO | /dev/null storage engine (anything you write to it disappears) | 
| EXAMPLE | NO | Example storage engine | 
| ARCHIVE | NO | Archive storage engine | 
| CSV | NO | CSV storage engine | 
| ndbcluster | NO | Clustered, fault-tolerant, memory-based tables | 
| FEDERATED | NO | Federated MySQL storage engine | 
| MRG_MYISAM | YES | Collection of identical MyISAM tables | 
| ISAM | NO | Obsolete storage engine | 
+------------+----------+----------------------------------------------------------------+

1）关闭mysqld服务
2）修改my.ini（linux下是my.cnf）将skip-innodb这行注释掉或删掉
3) 保存后重启mysqld服务

1

我的环境是linux

在my.cnf没有skip-innodb这个选项啊？