查看Linux系统版本的命令（3种方法）

cat /etc/issue

此命令也适用于所有的Linux发行版。

# cat /etc/issue
CentOS release 6.5 (Final)
Kernel \r on an \m

cat /etc/redhat-release

这种方法只适合Redhat系的Linux：

# cat /etc/redhat-release
CentOS release 6.5 (Final)

lsb_release -a

即可列出所有版本信息：

# lsb_release -a

No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 16.04.6 LTS
Release:	16.04
Codename:	xenial

查看Linux内核版本命令（两种方法）：

cat /proc/version

# cat /proc/version
Linux version 4.4.0-116-generic (buildd@lgw01-amd64-021) (gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.9) ) #140-Ubuntu SMP Mon Feb 12 21:23:04 UTC 2018

uname -a

#uname -a
Linux junjun 4.4.0-116-generic #140-Ubuntu SMP Mon Feb 12 21:23:04 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux