安装补全命令的包
[root@node01 ~]# yum list |grep bash
bash-completion.noarch 1:2.1-6.el7 base
bash-completion-extras.noarch 1:2.1-11.el7 epel

更多精彩
[root@node01 ~]# yum list |grep bash
bash-completion.noarch 1:2.1-6.el7 base
bash-completion-extras.noarch 1:2.1-11.el7 epel