理解MySQL――索引与优化

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查看ubuntu系统版本信息
方法一：cat /etc/issue

返回结果：Ubuntu 8.04.1 \n \l
方法二：cat /proc/version

返回结果：Linux version 2.6.24-21-generic (buildd@palmer) (gcc version 4.2.3 (Ubuntu 4.2.3-2ubuntu7)) #1 SMP Mon Aug 25 17:32:09 UTC 2008
方法三：uname -a

返回结果：Linux wwt-laptop 2.6.24-21-generic #1 SMP Mon Aug 25 17:32:09 UTC 2008 i686 GNU/Linux
方法四：lsb_release -a

返回结果：
No LSB modules are available.

Distributor ID: Ubuntu

Description: Ubuntu 8.04.1

Release: 8.04

Codename: hardy
方法五：cat /etc/lsb-release

返回结果：

DISTRIB_ID=Ubuntu

DISTRIB_RELEASE=8.04

DISTRIB_CODENAME=hardy

DISTRIB_DESCRIPTION="Ubuntu 8.04.1"