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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