ps is basically the same thing with window's task manager, you look for processes that are running.
So, just run ps aux | grep server
Where as aux is the parameter, grep is like a search tool, and server is for the key word.
In a fully running scenario, usually that command gives out 4 results, map, char, login and the grep command.
make sure that map, char, login servers are running.
Anyway, I'm guessing you already fixed the issue, just for added info.