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AppleScriptからUSB機器の接続チェック

do shell script で

system_profiler SPUSBDataType | grep '0x0714'

ここでgrepしてるのはプロダクトID。
調べ方はシステム情報からでも、

% system_profiler SPUSBDataType
〜〜〜〜〜〜〜〜〜〜〜〜〜〜
            PTK-440:

              Product ID: 0x00b8
              Vendor ID: 0x056a  (WACOM Co., Ltd.)
              Version: 1.04
              Speed: Up to 12 Mb/sec
              Manufacturer: Tablet
              Location ID: 0x14220000 / 5
              Current Available (mA): 500
              Current Required (mA): 300
〜〜〜〜〜〜〜〜〜〜〜〜〜〜〜〜

として拾っても。
一つしか無いことが分かっているなら

try
do shell script "system_profiler SPUSBDataType | grep '0x0714'"
on error
---無い時の処理
return
end try

とか?

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Help us understand the problem. What are the problem?