What do you mean it is not working? Does Realbot appear in the list when you type META LIST in the HLDS server console ?

Also, what version of RealBot are you using? If you are using the normal version (i.e. v1.0, and not the WIP version), then I think it does not use MetaMod, so it will not appear in the META LIST.

Let me boot up my Linux box and I'll see if I can remember how I set mine up and what versions I am using.