Since you're running bitcoind on a server, I'll go with the short version:
1. Move your Bitcoins to a new address.
2. Export the private keys from the addresses that held Bitcoin at the time of the fork.
3. Import the private keys into the
Bitcoin Cash wallet of your choice, and send them to wherever you want them.
4. Do the same for Bitcoin Gold and BitCore.
5. Never use these addresses again.
Whlie doing this, use proper security measures. Only export private keys after the addresses are empty, don't unstall untrusted software on your normal computer, don't enter private keys into random websitse that promise to really give you your fork coin, etc. MAKE SURE you don't send Bitcoin to Bitcoin Core addresses, or the other way around. You're very likely to lose your money at exchanges if you make this mistake.
This is the short version, if you have any more detailed questions, just ask