busybox支持命令自动补齐功能

    Shells  --->            

    ---  Bourne Shell Options

    [ ]  Hide message on interactive shell startup

    [ ]  Standalone shell

    *  command line editing

    *    vi-style line editing commands

    (15)    history size                

    *  history saving                  

    *  tab completion                  

    *  username completion              

    [ ]    Fancy shell prompts