[root@localhost ~]# ansible testhosts -m command -a 'rm -rf /tmp/haha'
 [WARNING]: Consider using the file module with state=absent rather than running 'rm'.  If you need to use command
because file is insufficient you can add 'warn: false' to this command task or set 'command_warnings=False' in
ansible.cfg to get rid of this message.
#vim /etc/ansible/ansible.cfg　　
　　command_warnings=False去掉#，注意要顶格