htpasswd:tldr:408a0

The command "htpasswd" is used to create, update, and manage user authentication files for basic authentication in Apache web servers. Here is an explanation of the provided command:

• "htpasswd" is the command itself.
• "-c" is an option that specifies the creation of a new file or overwriting an existing file with a new one.
• "${filename}" is a placeholder for the name and path of the file where the usernames and passwords will be stored.
• "${username}" is a placeholder for the desired username of the user that will be added to the authentication file.

Essentially, this command will create a new user authentication file (or overwrite an existing one) with the given filename and add a new user entry containing the specified username. After executing this command, the command-line interface will prompt you to enter a password for the user.