I opened a shell and creat a new account and use "miner.start()" than i opened a new shell and use "geth attach" command but failed， and the error message is
Fatal: Unable to attach to remote geth: dial unix /home/hzxscyq/.ethereum/geth.ipc: connect: no such file or directory
then i try "geth" and the error message is
Fatal: Error starting protocol stack: listen udp :30303: bind: address already in use
i want to know how to use geth attach?