請高人指點!!!!!!!!!!!!!!!!!!!!!!!!!!!?????????????? what means is this: ----------------------------------- _iog=${2:-"/dev/null"} _iog="" export  _iog -------------------------------------------------------- 請高人指點!!!!!!!!!!!!!!!!!!!!!!!!!!!?????????????? 第一行的結果就是_iog="/dev/null" 後面2行沒什麼好說的,這一定是個shell函數,而且能傳遞2個參數 [ 關閉窗口 ]