ubuntu coredump open position and set the core file is generated

1, sudo su
/ Profile 2, vim / etc
   add -c Unlimited ulimit
3, to create a core folder in your home directory, for example, I created a folder in the core / Home / JI
4, vim /etc/sysctl.conf
   Add
       kernel.core_pattern = / Home / houdar / Core / E_ core_%%% T P_
       kernel.core_uses_pid = 0
   Description:
    % E filename
    % p process PID
    % time T
5, reboot the computer to restart