Editing NGINX Basic Authentication (section)

=== Creating a Password File ===
To create username-password pairs, use a password file creation utility, for example, apache2-utils or httpd-tools

Verify that apache2-utils (Debian, Ubuntu) or httpd-tools (RHEL/CentOS/Oracle Linux) is installed.

Create a password file and a first user. Run the htpasswd utility with the -c flag (to create a new file), the file pathname as the first argument, and the username as the second argument:
 $ sudo htpasswd -c /etc/apache2/.htpasswd user1
Press Enter and type the password for user1 at the prompts.

Create additional user-password pairs. Omit the -c flag because the file already exists:
 $ sudo htpasswd /etc/apache2/.htpasswd user2
You can confirm that the file contains paired usernames and encrypted passwords:
 $ cat /etc/apache2/.htpasswd
 user1:$apr1$/woC1jnP$KAh0SsVn5qeSMjTtn0E9Q0
 user2:$apr1$QdR8fNLT$vbCEEzDj7LyqCMyNpSoBh/
 user3:$apr1$Mr5A0e.U$0j39Hp5FfxRkneklXaMrr/