Linux users and user groups cannot be full numbers. linux User Groups

Linux users and user groups cannot be full numbers. linux User Groups

To encapsulate the command line today, you need to create users and user groups. The following problems are encountered,

At that time, I was confused. Why did the user group '123' exist clearly, but it prompts that it does not exist ?? Is it a linux bug ???

Then I tried several more:

If the user group is a full number, an error is reported and the user cannot be created.

I'm just a lazy user group name. If groupadd 1111 is used directly, the user group name can be created successfully. The error may be the same as that of me when I add a user.

Therefore, we recommend that you do not use full numbers when creating users and user groups. It is best to use a combination of numbers and letters.

Hope to help you.