解决You have new mail in /var/spool/mail/root提示

[root@node01 ~]# cat /dev/null > /var/spool/mail/root
[root@node01 ~]# cat /var/spool/mail/root            
[root@node01 ~]# echo "unset MAILCHECK">> /etc/profile
[root@node01 ~]# source /etc/profile
[root@node01 ~]# kafka-topics.sh --zookeeper localhost:2181 --list 
mytopic
mytopic2