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Doesn't sound like you need to know the shell, but how to edit your path. Type $PATH to find out your current user's path. To edit the path you can edit the files .bashrc and or .bash_profile in most cases if your using Redhat.
By default, Redhat will most likely be using bash as the shell.
>When you try to login as sid, what error do you get?
It tries to log in as normal, that is the process when it checks for password etc and load the desktop. But it doesn't actually finish so the result is that I back to the login window. No matter how many time I enter user name "sid" and password, I don't actually get logged in.
>Type 'su sid', and your password.
[root@localhost root]$ su sid
[sid@localhost root]$ javac
However I am still logged in as root so do not have all my desktop icons, I think I would like to login as sid, but HOW?
What does it mean that you can't log in? Check into /etc/passwd, line with 'sid:'. After last ':' in this file you have your shell, for example /bin/bash. Look if it is set correctly.
If you just can't log as sid because of password problems, log in as root and
to change the password.