It's come to my attention that for some odd reason, people are still attempting to use my old instructions to get a working copy of DreamSeeker going, which they're very out of date. So here is some very simple instructions on how to get this working.
I actually did this using PuTTY on my schools network, in which, I have no administrator access, so there's no reason you can't get it working yourself.
This is going by the assumption that you're starting in the home directory(~), and have make already installed. If you don't, you'll want to google how to install make for your flavour of linux.
mkdir BYOND
cd BYOND
wget http://www.byond.com/download/build/354/354_byond_linux.zip
unzip 354_byond_linux.zip
cd byond
make here
cd bin
byondsetup
wget http://www.byond.com/download/build/gcc/libstdc++.so.5
export LD_LIBRARY_PATH=~/BYOND/byond/bin
DreamSeeker
Version 354 was the last known version of BYOND to actually include a Dream Seeker, which means that your Dream Seeker is going to be massively out-dated. You'll also be very unlikely to find any join-able game, since your Dream Seeker will be from before BYOND 4.0, so you'll need to find a server that's being hosted on a version before then. So if you really want to play something in the terminal, you're going to have to make it yourself. If you do, tell me. I want to play.