查看linux系统版本
cat /etc/redhat-release,这种方法只适合Redhat系的Linux
[root@pingtai2 yum.repos.d]# cat /etc/redhat-release
CentOS Linux release 7.3.1611 (Core)
uname -a,查看当前操作系统内核信息
[root@pingtai2 yum.repos.d]# uname -a
Linux pingtai2 3.10.0-514.21.2.el7.x86_64 #1 SMP Tue Jun 20 12:24:47 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
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