怎么看linux系统版本号？

1获取内核版本号（2个办法）

1、cat /proc/version
2、uname -a

[samba@centos share]$ uname -a
Linux centos 3.10.0-957.5.1.el7.x86_64 #1 SMP Fri Feb 1 14:54:57 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
[samba@centos share]$ cat /proc/version
Linux version 3.10.0-957.5.1.el7.x86_64 ([email protected]) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-36) (GCC) ) #1 SMP Fri Feb 1 14:54:57 UTC 2019

2查看Linux系统版本的命令

1、cat /etc/issue （不知道咋回事，不好使）

[samba@centos share]$ cat /etc/issue
\S
Kernel \r on an \m

2、lsb_release -a （有时候没有这个命令，出现“-bash: lsb_release: command not found”）

[samba@centos cpp]$ lsb_release -a 
LSB Version:	:core-4.1-amd64:core-4.1-noarch:cxx-4.1-amd64:cxx-4.1-noarch:desktop-4.1-amd64:desktop-4.1-noarch:languages-4.1-amd64:languages-4.1-noarch:printing-4.1-amd64:printing-4.1-noarch
Distributor ID:	CentOS
Description:	CentOS Linux release 7.6.1810 (Core) 
Release:	7.6.1810
Codename:	Core

3、解决找不到lsb_release的办法：
解决方法：yum install redhat-lsb -y