linux查看内核版本命令有哪些，如何查看centos系统内核。

如下三个命令：

uname  -r

uname -a

cat /proc/version

hostnamectl |grep -i kernel

[root@VM_0_3_centos ~]# uname -r
3.10.0-862.el7.x86_64
[root@VM_0_3_centos ~]# uname
Linux
[root@VM_0_3_centos ~]# uname -a
Linux VM_0_3_centos 3.10.0-862.el7.x86_64 #1 SMP Fri Apr 20 16:44:24 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
[root@VM_0_3_centos ~]# cat /proc/version
Linux version 3.10.0-862.el7.x86_64 (builder@kbuilder.dev.centos.org) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-28) (GCC) ) #1 SMP Fri Apr 20 16:44:24 UTC 2018
[root@VM_0_3_centos ~]# hostnamectl |grep -i kernel
            Kernel: Linux 3.10.0-862.el7.x86_64