[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