查看内核的几种方法：
1. uname -a #显示详细的内核信息，Linux localhost.localdomain 2.6.18-92.1.6.el5xen #1 SMP Wed Jun 25 12:56:52 EDT 2008 x86_64 x86_64 x86_64 GNU/Linux
2. cat /etc/issue #显示版本类型Scientific Linux SL release 5.2 (Boron)
Kernel \r on an \m
3. cat /proc/versionLinux version 2.6.18-92.1.6.el5xen ([email protected]) (gcc version 4.1.2 20071124 (Red Hat 4.1.2-42)) #1 SMP Wed Jun 25 12:56:52 EDT 2008