shuhua hua commented on a discussion: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/202#note_111788


Just as when we use other systems such as the Linux system, user account 
information is typically stored in the /etc/passwd file, with each account 
having a line of records that include the username, password (stored in an 
encrypted form), user ID, group ID, and other information. Records with a blank 
username are not permitted because this would cause the system to be unable to 
correctly identify and manage the user. 
If a user does not wish to use a username, they can set the login_check 
parameter to NULL in rtems_shell_init when logging into the shell. 
Currently, during system startup, when prompting the user to enter a username, 
some additional printouts may be appended after the username prompt. Users 
usually press the Enter key, which then leads to a password prompt, and 
pressing Enter again will lead to a prompt to re-enter the username. By 
incorporating a check to see if the user's input for the username is empty, the 
system can directly prompt the user to enter a username, thus avoiding the 
aforementioned operations.

-- 
View it on GitLab: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/202#note_111788
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