Okay here\'s my problem. I type in \"rails s\" and then my terminal won\'t let me type in any commands. So I have to start a new terminal window, which is pretty annoying. <
I don't believe there is a way to do the thing you are specifically asking for.
However, I use Iterm2 which allows me to open multiple terminal windows in one window, either by splitting my iTerm2 window or by creating multiple tabs. That way I can just make the terminals that are holding rails server and my development.log tail very small unless something interesting happens in them.
You can type: rails s &
. I'm not sure if this is what you meant.
I use screen, you can also use TMUX but they are window managers in terminal and you can create multiple windows in same terminal window :)
Read up on them at WikiVS as that might help you :) http://www.wikivs.com/wiki/Screen_vs_tmux
Screen: http://www.gnu.org/software/screen/ TMUX: http://tmux.sourceforge.net/
So you can easily switch and maintain same terminal window. You can't obviously use the EXACT same window that rails server running but it's close enough without having to do the searching for the PID.