Newsgroups: comp.unix.shell
> Is there a way that I can tell (in my login script) that whether I'm
> loggin in via telnet or rsh/rlogin?
>
> I realized that I need different mechanizm to set my DISPLAY for telnet
> or rsh/rlogin. Thanks

As far as I can tell, there is no variable that is set as standard which tells the shell which method you used to log in. The only hope you have is that there is some difference in the set up which means that different environment variables are set depending on how you log in. I did a test on two different machines that I have access to at Uni. The test was:

$ rlogin machine password:

..messages…. machine $ export > rlogin.export machine $ logout $ telnet machine

login: me password:

..messages…. machine $ export > telnet.export machine $ diff rlogin.export telnet.export … possible output …

On one machine, a sparc SunOS 5.7, there were differences which could be used as a test. However, on another machine I tried it on, sparc SysV 4.0, there was absolutely no difference. I think that unless there is some difference in the initial environment when you first log in, it is going to be very difficult to tell one way or the other. The test would be very unportable and very "hit-and-miss".

Perhaps if you explained why you need two different DISPLAY variables for the different methods, somebody could come up with a solution to your problem.

Another possibility is to install ssh. In addition to being more secure than rsh or telnet, it automatically sets up the display: hence you wouldn't need to worry about it! ;-)

Dave.

>> 2000.05.05 Fri 19:51:01