安装bash软件包 bash-completion 大部分包管理器都会在 /etc/profile.d/ 创建自动启动脚本

也可以自己编辑 ~/.bashrc，然后重载 source ~/.bashrc

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# enable bash completion in interactive shells
if ! shopt -oq posix; then
  if [ -f /usr/share/bash-completion/bash_completion ]; then
    . /usr/share/bash-completion/bash_completion
  elif [ -f /etc/bash_completion ]; then
    . /etc/bash_completion
  fi
fi