yum install -y epel-release
yum install -y net-tools
yum install -y vim
systemctl status firewalld
systemctl stop firewalld systemctl disable firewalld.service
vim /etc/sudoers
su 用户
sudo mkdir module sudo mkdir software
sudo给普通用户,超级用户的权限
sudo chown atguigu:atguigu module/ software/
rpm -qa | grep -i java | xargs -n1 rpm -e --nodeps
reboot