查看Ubuntu版本方法
（1）cat /etc/issue
返回 Ubuntu 11.10 \n \l
（2）sudo lsb_release -a
返回
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 11.10
Release: 11.10
Codename: oneiric
查看内核版本方法
（1）cat /proc/version
返回 Linux version 3.0.0-12-generic (buildd@vernadsky) (gcc version 4.6.1 (Ubuntu/Linaro 4.6.1-9ubuntu3) ) #20-Ubuntu SMP Fri Oct 7 14:50:42 UTC 2011
（2）uname -a
返回 Linux ubuntu 3.0.0-12-generic #20-Ubuntu SMP Fri Oct 7 14:50:42 UTC 2011 i686 athlon i386 GNU/Linux
