dialups is an ASCII file which contains a list of terminal devices that require a dial-up password. A dial-up password is an additional password required of users who access the computer through a modem or dial-up port. The correct password must be entered before the user is granted access to the computer. The set of ports that require a dial-up password are listed in the dialups file.
Each entry in the dialups file is a single line of the form:
The full path name of the terminal device that will require a dial-up password for users accessing the computer through a modem or dial-up port.
The dialups file should be owned by the root user and the root group. The file should have read and write permissions for the owner (root) only.