Linux的$?變數內容是什麼?
$?代表指令的回傳值，回傳0代表指令正常運作，回傳不等於0代表指令運作異常
Below is an instruction that describes a task. Write a response that appropriately completes the request. ### Instruction: Linux的$?變數內容是什麼? ### Response: $?代表指令的回傳值，回傳0代表指令正常運作，回傳不等於0代表指令運作異常 