mosquitto_passwd
mosquitto_passwd
TLDR
Add a new user to a password file (will prompt to enter the password)
$ mosquitto_passwd [path/to/password_file] [username]
Create the password file if it doesn't already exist
$ mosquitto_passwd -c [path/to/password_file] [username]
Delete the specified username instead
$ mosquitto_passwd -D [path/to/password_file] [username]
Upgrade an old plain-text password file to a hashed password file
$ mosquitto_passwd -U [path/to/password_file]