fix cpu used 100%

fix error url in host search page

fix user can not get login logs bug

some system user '\n\r' as line break, if we split commands by '\n',
then '\r' will be considered as part of commands which will break sudo
authentication. we can use splitlines function to avoid the problem.

a small bug

update url

修复当用户使用Ctrl+C结束进程时,没有正确退出