1、利用vi编辑器打开 /etc/bash.bashrc文件（需要root权限）

sudo vi /etc/bash.bashrc

接下来会提示输入密码

此时vi可能会出现上下左右出现问题,解决办法：

(1)执行命令 sudo apt-get remove vim-common

(2)执行命令 sudo apt-get install vim


2、找到文件中的下列代码

#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

将注释符号#去掉，即改成


#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


3、最后 source一下 /etc/bash.bashrc即可， 即

sudo source /etc/bash.bashrc