CentOS 安装tab命令补全

# 安装epel源
yum -y install epel-release
# 加快yun速度
yum -y install yum-plugin-fastestmirror
# 安装bash-completion
yum -y install bash-completion
# 立即生效或者退出终端重新登录
source /etc/profile.d/bash_completion.sh