Wednesday, September 9, 2009

group14_indigo:this week report of remote login

For using the TELNET command for remote login the syntax is:

-->telnet host name

After connecting with the remote host, you will be prompted for your login id and your password just as if you were logging on via a terminal on that system.


For using the RLOGIN command for remote login the syntax is:

-->rlogin hostname

This command provides an advantage over the telnet command that is here in this command you can specify a username on the command line, ahttp://www.blogger.com/post-create.g?blogID=1013281640107267804nd can set it up so that when you rlogin to a host you will not be prompted for a password. Rlogin assumes you wish to login to an account with the same name as the account you are presently logged in as. If you wish to change this, use the -l option.

Rlogin: Remote Login in UNIX systems

rlogin (remote login) is a UNIX command that allows an authorized user to login to other UNIX machines (hosts) on a network and to interact as if the user were physically at the host computer. Once logged in to the host, the user can do anything that the host has given permission for, such as read, edit, or delete files.

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 host- name 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 and and flushing of input and output on interrupts are handled properly.

A secure version of rlogin (slogin) was combined with two other UNIX utility, ssh and scp, in the Secure Shell suite, an interface and protocol created to replace the earlier utilities.




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