Who is <admin> for install.php during Mediawiki install?

Question

I'm installing Mediawiki 1.31 on CentOS 7. I'm following the instructions at Manual:Installing_MediaWiki. I'm having a trouble running install.php.

An earlier step had me create the MySQL database using:

CREATE DATABASE wikidb;
CREATE USER 'wikiuser'@'localhost' IDENTIFIED BY 'password';
GRANT ALL PRIVILEGES ON wikidb.* TO 'wikiuser'@'localhost' WITH GRANT OPTION;

Next, I am suppose to run php maintenance/install.php. However, they omit instructions on how to do so. The script is failing with:

# php maintenance/install.php
Argument <admin> required!

CLI-based MediaWiki installation and configuration.
Default options are indicated in parentheses.
...

Arguments:
    [name]: The name of the wiki (MediaWiki)
    <admin>: The username of the wiki administrator.

My question is, who is <admin>? Is it root on this machine? Is it wikiuser from the previous step? Or do I need to create another user and give it root privileges for the database? Or something else?

Answer 1

It is the MediaWiki username you want to give your first user. It's a largely arbitrary up-to-255-byte string (there are a few banned characters like @#<>|).

You know there is a much more user-friendly web installer, right?