Hush shell can only excute built-in command after it is activated

[=?gb2312?B?1cW+/Of3?=]

Hi, all:
 
    I select hush as my shell when build busybox1.2.0. I can run "ls",
"mkdir", ....... commands before hush shell is activated. But after
hush shell console is activated, I can only run command built-in it. For
example, "cd", "pwd", "help". If I run commands not built-in it, for
example, "ls", it do nothing.
    Why? Can anybody meet the problem also?
    Any clues are welcomed!
 
   Thanks a lot.
 
 
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