mosquitto_passwd:tldr:325f4

The command mosquitto_passwd -c ${path-to-password_file} ${username} is used to add or update a username and password pair in the Mosquitto password file.

Here is a breakdown of the command:

• mosquitto_passwd: This is the command to interact with the Mosquitto password file.
• -c: This option is used to create a new password file or overwrite an existing one.
• ${path-to-password_file}: This is the path to the password file that will be created or overwritten. You need to replace ${path-to-password_file} with the actual file path where you want the password file to be located.
• ${username}: This is the username that you want to add or update in the password file. You need to replace ${username} with the desired username.

Upon running this command, you will be prompted to enter a password for the specified username. After entering the password, it will be stored securely in the password file. If the specified password file does not exist, it will be created. If it already exists, the specified username will be added or updated with the new password.

For example, if you want to create or update a user called "john" in the password file located at "/etc/mosquitto/passwd", you would run:

mosquitto_passwd -c /etc/mosquitto/passwd john

You would then be prompted to enter the password for the "john" user.