AppleScript ping shell腳本始終返回true

Question

我試圖在主機進入或脫機時使此AppleScript提醒我。所有工作正常，如果我將do shell script行更改爲set connected to true/false，所以我知道其餘的代碼工作。但do shell script行似乎總是返回true。當我在終端中運行它時，它工作正常，但由於某種原因，在AppleScript中它沒有。即使我將主機設置爲每次在終端中返回false的隨機IP地址，每次都會返回「真」（do shell script）。我從this得到了shell腳本的答案。

on run 
    set oldconnected to false 
    repeat 
     set connected to do shell script "ping -o -t 5 My-Host.local >/dev/null && echo yes || echo no" as boolean 

     if connected and not oldconnected then 
      display notification "Device has connected" 
     end if 

     if not connected and oldconnected then 
      display notification "Device has disconnected" 
     end if 

     set oldconnected to connected 
     delay 5 
    end repeat 
end run 

Answer 1

您錯過了do調用的一些括號。替換：

set connected to do shell script "ping -o -t 5 My-Host.local >/dev/null && echo yes || echo no" as boolean 

有：

set connected to (do shell script "ping -o -t 5 My-Host.local >/dev/null && echo yes || echo no") as boolean 

，你應該是好去！