vi /etc/bash.bashrc
反注释掉该部分内容即可
1. #enable bash completion in interactive shells
2. #if ! shopt -oq posix; then
3. # if [-f /usr/share/bash-completion/bash_completion ]; then
4. # . /usr/share/bash-completion/bash_completion
5. # elif [ -f /etc/bash_completion]; then
6. # . /etc/bash_completion
7. # fi
8. #fi
原文:https://www.cnblogs.com/qianxunman/p/13546508.html