阿里云 SUSE操作系统，如何查看操作系统版本？

背景描述：

　　今天需要统计操作系统版本，我在其中一台主机上执行cat /etc/redhat-release发现没有这个，应该知道不是redhat系统，然后想，怎么查来着，忘了，找了下，再此记录下。

### 查看操作系统及版本信息：

1.cat /etc/issue

txprd@xxx806:~> cat /etc/issue

Welcome to SUSE Linux Enterprise Server 11 SP2  (x86_64) - Kernel \r (\l).

2.lsb_release -a

txprd@xxxx806:~> lsb_release -a
LSB Version:    core-2.0-noarch:core-3.2-noarch:core-4.0-noarch:core-2.0-x86_64:core-3.2-x86_64:core-4.0-x86_64:desktop-4.0-amd64:desktop-4.0-noarch:graphics-2.0-amd64:graphics-2.0-noarch:graphics-3.2-amd64:graphics-3.2-noarch:graphics-4.0-amd64:graphics-4.0-noarch
Distributor ID: SUSE LINUX
Description:    SUSE Linux Enterprise Server 11 (x86_64)
Release:        11
Codename:       n/a

3.如果是redhat、centos，执行cat /etc/redhat-release

[root@abc-xxx-14 ~]# cat /etc/redhat-release 
Red Hat Enterprise Linux Server release 6.6 (Santiago)