A Unix password file as understood by the AuthBy UNIX module is an ASCII file consisting of one line per user. There are at least 2 colon (:) separated fields per line. The first field is the user name, and the second is the crypt(3) encrypted password. The third and subsequent fields (if they are present) are ignored.

It will be recognised that this description fits the standard Unix password file format, and Radiator will work with /etc/password on Unix implementations that do not use a password shadow file. It will work with /etc/shadow on Unix implementations that do use a password shadow file (Radiator will need to run as root to get read access to /etc/shadow).