查看CentOS版本

Command	Description
$ rpm -q centos-release	CentOS version valid for CentOS 6 and higher. Causes to reveal major, minor and asynchronous CentOS version.
$ lsb_release -d	Requires redhat-lsb package to be installed before execution.
$ rpm -E %	RPM macro to reveal a major CentOS version
$ rpm --eval %	RPM macro to display a major version of CentOS
$ cat /etc/centos-release	Linux cat command to output content of the /etc/centos-release to query CentOS version. Works with CentOS 6 and higher.