AppleScript ping shell脚本始终返回true

Question

我试图在主机进入或脱机时使此AppleScript提醒我。所有工作正常，如果我将do shell script行更改为set connected to true/false，所以我知道其余的代码工作。但do shell script行似乎总是返回true。当我在终端中运行它时，它工作正常，但由于某种原因，在AppleScript中它没有。即使我将主机设置为每次在终端中返回false的随机IP地址，每次都会返回“真”（do shell script）。我从this得到了shell脚本的答案。

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

您错过了do调用的一些括号。替换：

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 

，你应该是好去！