Conveniently kill your rails server

#mac

cat tmp/pids/server.pid | xargs -n1 -J pid kill -9 pid

#xfce linux

cat tmp/pids/server.pid | xargs -n1 -I pid kill -9 pid

This will read the file server.pid and redirect the output as an argument to kill. That way you don't have to look up the ever-changing pid.