linux - 一个uid可以对应多个用户名吗？

Question

如果可以如何添加同一uid下的多个用户名？

Answer 1

useradd
-u user number specifies the uid. If the -o option is also present, the uid of other users can be reused.

Answer 2

Isn’t this design unreasonable? Why does one uid need multiple users? If you want to design it as one account that can add sub-accounts, then the uid is still unique, and you need to add a pid, pointing to the uid of the parent account

Answer 3

You should build a relationship table, one-to-many
A table:
id uid

B table (relationship table):
A.id userName(1,2...)

Answer 4

Yes, the kernel ultimately identifies the user based on uid.

Answer 5

Wouldn’t it be enough to set each username into a field, such as username1, username2...