查看Ubuntu版本
user@vps:~$ cat /etc/issue
Ubuntu 9.10 \n \l
user@vps:~$ sudo lsb_release -a
[sudo] password for user:
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 9.10
Release: 9.10
Codename: karmic
user@vps:~$ cat /etc/issue
Ubuntu 9.10 \n \l
user@vps:~$ sudo lsb_release -a
[sudo] password for user:
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 9.10
Release: 9.10
Codename: karmic