前面很多问题，感觉和权限有关，索性把常用账号改成管理员。
修改原因，1、威联通界面没找到可以上网的地方，无法测试网络连通情况，2、ssh界面不让使用ping命令，说是没有权限，3、网络配置路由需要调试。
以yuanda为例
[/etc] # cat passwd admin:x:0:0:administrator,,administrator,:/share/homes/admin:/bin/sh guest:x:65534:65534:guest:/tmp:/bin/sh httpdusr:x:99:0:Apache httpd user:/tmp:/bin/sh yuanda:x:1000:100:Linux User,000000000@qq.com,,:/share/homes/yuanda:/bin/sh [/etc] # vim passwd [/etc] # cat passwd admin:x:0:0:administrator,,administrator,:/share/homes/admin:/bin/sh guest:x:65534:65534:guest:/tmp:/bin/sh httpdusr:x:99:0:Apache httpd user:/tmp:/bin/sh yuanda:x:0:100:Linux User,000000000@qq.com,,:/share/homes/yuanda:/bin/sh
把yuanda的第二个1000，改成0，保存后，在用yuanda登录直接显示admin。
