System Administration Guide, Volume 3

Login Service

The /usr/sbin/aspppls login service is invoked as a login shell that starts PPP after you dial up and log in. Its function is similar to the /usr/lib/uucp/uucico command described in "UUCP Software". When configuring a machine as a dial-in server, you must specify aspppls as the login shell in the /etc/passwd file in the entries for every nomadic computer allowed to dial in to the local host.