rlogin establishes a remote login session from your terminal to the remote machine named hostname.
Hostnames are listed in the hosts database, which may be contained in the /etc/hosts and /etc/inet/ipnodes files, the Network Information Service (NIS) hosts map, the Internet domain name server, or a combination
of these. Each host has one official name (the first name in the database entry), and optionally one or more nicknames. Either official hostnames or nicknames may be specified in hostname.
Each remote machine may have a file named /etc/hosts.equiv containing a list of trusted hostnames with which it shares usernames. Users with the same username on both the local and remote machine may rlogin from the machines listed in the remote machine's /etc/hosts.equiv file without supplying a password. Individual users may set up a similar private equivalence list with the file .rhosts in their home directories. Each line in this file contains two names: a hostname and a username separated by a space. An entry in a remote user's .rhosts file permits the user named username who is logged into hostname to log in to the remote machine as the remote user without supplying a password. If the name
of the local host is not found in the /etc/hosts.equiv file on the remote machine, and the local username and hostname are not found in the remote user's .rhosts file, then the remote machine will prompt for a password. Hostnames listed in /etc/hosts.equiv and .rhosts files must be the official hostnames listed in the hosts database; nicknames may not be used in either of these files.
For security reasons, the .rhosts file must be owned by either the remote user or by root.
The remote terminal type is the same as your local terminal type (as given in your environment TERM variable). The terminal or window size is also copied to the remote system if the server supports the option, and changes in size are reflected as well. All echoing takes place at
the remote site, so that (except for delays) the remote login is transparent. Flow control using CTRL-S and CTRL-Q and flushing of input and output on interrupts are handled properly.