第2个回答 2018-08-20
I guess the test.txt belongs to group user and user admin (and others) . Or we can say these three have different rights to test.txt. They didn't real own the test.txt.
I think user needn't be in that group. All the users in that group have the group's authority which was showed in command "ll". And the user can be in that group or not. He is independent.
sorry for no pinyin. Here is the translation give by fanyi.baidu.com
我猜Test.txt属于组用户和用户管理(和其他)。或者我们可以说这三个有不同的权利Test.txt。他们并没有真正拥有Test.Txt。
我认为用户不必在那个群体中。该组的所有用户都具有命令“LL”中显示的组权限。用户可以在该组中。他是独立的。