The Rlogin command is like an automated login command. Much like the Telnet command, you can access other hosts. Unlike the Telnet command, it logs you in automatically. You don't have to enter your user name and password. To successfully use this command, you must have login on the specified host.
[ames]$ rlogin rex Trying... Connected to REX Tulane University, Dept. of Computer Science Pyramid 9815 OSx 5.1 (UNIX) login: <<WHEN YOU USE THIS COMMAND, IT WILL NOT REQUIRE LOGIN INFORMATION>> password: Authentication successful. Last login: Sat Nov 3 14:56:42 2012 on line (504) 865-5840 # # WARNING: You must have prior authorization to access this system. # All connections are logged and monitored. By connecting to # to this system you fully consent to all monitoring. # Unauthorized access or use will be prosecuted to the full # extent of the law. # # rex$