centos如何查看版本号

[root@sky9896sky]# lsb_release -a

bash:lsb_release: command not found

[root@sky9896sky]#yum install lsb ?Cy

[root@sky9896sky]# lsb_release -a

LSBVersion:base-4.0-amd64:base-4.0-noarch:core-4.0-amd64:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-noarch

DistributorID: CentOS

Description:    CentOS release 6.7 (Final)

Release:        6.7

Codename:       Final

[root@sky9896 sky]# cat /etc/redhat-release

CentOSrelease 6.7 (Final)