RLOGIN(1)                  Commands and Applications                 RLOGIN(1)




NAME

       rlogin - remote login


SYNOPSIS

       rlogin [-8DEKLdx] [-e char] [-k realm] [-l username] host


DESCRIPTION

       Rlogin starts a terminal session on a remote host host.

       Rlogin  first  attempts  to  use  the Kerberos authorization mechanism,
       described below.  If the remote host does not supporting  Kerberos  the
       standard  Berkeley authorization mechanism is used.  The options are as
       follows:

       -8     The -8 option allows an eight-bit input data path at all  times;
              otherwise parity bits are stripped except when the remote side's
              stop and start characters are other than ^S/^Q.

       -D     The -D option sets  the  TCP_NODELAY  socket  option  which  can
              improve interactive response at the expense of increased network
              load.

       -E     The -E option stops any character from being  recognized  as  an
              escape character.  When used with the -8 option, this provides a
              completely transparent connection.

       -K     The -K option turns off all Kerberos authentication.

       -L     The -L option allows the rlogin session to be run in  ''litout''
              (see tty(4)) mode.

       -d     The  -d  option turns on socket debugging (see setsockopt(2)) on
              the TCP sockets used for communication with the remote host.

       -e     The -e option allows user specification of the escape character,
              which  is ''~'' by default.  This specification may be as a lit-
              eral character, or as an octal value in the form \nnn.

       -k     The -k option requests rlogin to obtain tickets for  the  remote
              host in realm realm instead of the remote host's realm as deter-
              mined by krb_realmofhost(3).

       -x     The -x option turns on DES encryption for all  data  passed  via
              the  rlogin session.  This may impact response time and CPU uti-
              lization, but provides increased security.

       A line of the form ''<escape char>.'' disconnects from the remote host.
       Similarly,  the  line  ''<escape char>^Z'' will suspend the rlogin ses-
       sion, and ''<escape char><delayed-suspend  char>''  suspends  the  send
       portion  of  the  rlogin, but allows output from the remote system.  By
       default, the tilde (''~'') character is the escape character, and  nor-
       mally control-Y (''^Y'') is the delayed-suspend character.

       All echoing takes place at the remote site, so that (except for delays)
       the rlogin is transparent.  Flow control  via  ^S/^Q  and  flushing  of
       input and output on interrupts are handled properly.


KERBEROS AUTHENTICATION

       Each  user may have a private authorization list in the file .klogin in
       their home directory.  Each line in this file should contain a Kerberos
       principal  name of the form principal.instance@realm.  If the originat-
       ing user is authenticated to one of the principals  named  in  .klogin,
       access  is  granted  to the account.  The principal accountname.@local-
       realm is granted access if there is no .klogin file.  Otherwise a login
       and password will be prompted for on the remote machine as in login(1).
       To avoid certain security problems, the .klogin file must be  owned  by
       the remote user.

       If  Kerberos authentication fails, a warning message is printed and the
       standard Berkeley rlogin is used instead.


ENVIRONMENT

       The following environment variable is utilized by rlogin:

       TERM   Determines the user's terminal type.


SEE ALSO

       rsh(1), kerberos(3), krb_sendauth(3), krb_realmofhost(3)


HISTORY

       The rlogin command appeared in 4.2BSD.


BUGS

       Rlogin will be replaced by telnet(1) in the near future.

       More of the environment should be propagated.



GNO                              16 April 1998                       RLOGIN(1)

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