Ubuntu14.04系统Tab键不能自动补全问题解决

Unbuntu 14.4安装之后就在终端中使用Tab键不能自动补全，解决办法如下：

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
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