How to modify the root user name in Linux

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1. Taking CentOS as an example, after logging in, modify /etc/passwd and /etc/shadow, change root at the beginning of the first line to a new user name (such as admin), and pass wq! Save.

2. After modifying and saving, it will take effect after restarting the server. You can check the permissions of the file, and you can see that the account number has changed to admin , as follows:

Note: The default user with the highest administrative authority in Linux is root, and uid is 0. Only uid is recognized in the system, so as long as uid is 0, the system is considered the top administrative user. However, there may be certain problems with the application. Some software uses the root user by default. Therefore, it is not recommended to adjust the user name for root when the understanding of the software application is limited.

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