有以下命令可以查看：
# lsb_release -a
LSB Version: :core-3.1-ia32:core-3.1-noarch:graphics-3.1-ia32:graphics-3.1-noarch
Distributor ID: CentOS
Description: CentOS release 5.4 (Final)
Release: 5.4
Codename: Final
这个命令适用于所有的linux，包括Redhat、SuSE、Debian等发行版。
root@MyMail ~ # uname
Linux
root@MyMail ~ # uname -r
2.6.18-164.el5
以下二种方法适用于RedHat,CentOS
root@MyMail ~ # cat /etc/redhat-release
CentOS release 5.4 (Final)
登录到linux执行rpm -q redhat-release
#rpm -q redhat-release
或CentOS
root@MyMail ~ # rpm -q centos-release
centos-release-5-4.el5.centos.1
http://www.cnblogs.com/hitwtx/archive/2012/02/13/2349742.html