查版本号的命令：1、“cat /etc/issue”或“cat /etc/redhat-release”，可输出centos版本号；2、“cat /proc/version”、“uname -a”或“uname -r”，可输出内核版本号。
本教程操作环境：centos6.5系统、thinkpad t480电脑。
cat /etc/issue
[root@localhost ~]# cat /etc/issue CentOS release 6.5 (Final) Kernel \r on an \m
cat /etc/redhat-release
[root@localhost ~]# cat /etc/redhat-release CentOS release 6.5 (Final)
cat /proc/version
[root@localhost ~]# cat /proc/version Linux version 2.6.32-754.15.3.el6.x86_64 (mockbuild@x86-01.bsys.centos.org) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-23) (GCC) ) #1 SMP Tue Jun 18 16:25:32 UTC 2019
uname -a
[root@localhost ~]# uname -a Linux localhost.localdomain 2.6.32-754.15.3.el6.x86_64 #1 SMP Tue Jun 18 16:25:32 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
uname -r
[root@localhost ~]# uname -r 2.6.32-754.15.3.el6.x86_64
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