需要使用到bash-completion

https://github.com/scop/bash-completion

先检查本地有没有

cd /usr/share/bash-completion

如果有，则不用安装，直接配置即可

一、配置

不生效时需要在配置文件 ~/.bashrc 配置如下内容，具体参考github上官方文档

# Use bash-completion, if available
[[ $PS1 && -f /usr/share/bash-completion/bash_completion ]] && \
    . /usr/share/bash-completion/bash_completion

complete -W "$(echo $(grep '^ssh ' ~/.bash_history | sort -u | sed 's/^ssh //'))" ssh

二、安装

1、在线安装

yum install -y bash-completion

2、离线安装

下载：https://github.com/scop/bash-completion/releases/download/2.14.0/bash-completion-2.14.0.tar.xz

mv bash-completion-2.14.0.tar.xz /usr/share && cd /usr/share

# 解压
tar -xvJf  bash-completion-2.14.0.tar.xz

rm -f bash-completion-2.14.0.tar.xz

mv bash-completion-2.14.0 bash-completion