1.安裝wget下載工具
yum install wget -y
2.下載
wget https://rpmfind.net/linux/centos/7.9.2009/os/x86_64/Packages/bash-completion-2.1-8.el7.noarch.rpm
3.安裝
rpm -ivh bash-completion-2.1-8.el7.noarch.rpm
3.配置立即生效
source /etc/profile
4.測(cè)試
輸入任意命令,如systemctl re 按Tab鍵會(huì)給出提示