今天找到了一個能100%確認是那一套Linux distribution的指令了，lsb_release，以下列出了cat /etc/issue與lsb_release去確認Linux distribution的結果：
1.lsb_release -a
[root@pollux max]# lsb_release -a
LSB Version: :core-3.0-ia32:core-3.0-noarch:graphics-3.0-ia32:graphics-3.0-noarch
Distributor ID: RedHatEnterpriseAS
Description: Red Hat Enterprise Linux AS release 4 (Nahant Update 4)
Release: 4
Codename: NahantUpdate4
2.cat /etc/issue
[root@pollux max]# cat /etc/issue
Red Hat Enterprise Linux AS release 4 (Nahant Update 4)
Kernel \r on an \m
