一、uname -a
# uname -a
Linux VM_0_3_centos 3.10.0-957.21.3.el7.x86_64 #1 SMP Tue Jun 18 16:35:19 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
二、cat /proc/version
# cat /proc/version
Linux version 3.10.0-957.21.3.el7.x86_64 (mockbuild@kbuilder.bsys.centos.org) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-36) (GCC) ) #1 SMP Tue Jun 18 16:35:19 UTC 2019
一和二显示结果都是linux内核的版本号，只是方法二中多了redhat信息
三、cat /etc/redhat-release
# cat /etc/redhat-release
CentOS Linux release 7.6.1810 (Core)
系统安装时CentOS默认的发行版信息