macOS-监视文件夹

[文件夹操作设置](/System/Library/CoreServices/Applications/Folder Actions Setup.app)

https://developer.apple.com/library/archive/documentation/LanguagesUtilities/Conceptual/MacAutomationScriptingGuide/WatchFolders.html

或者用 FSEvents & FSEventStream
https://developer.apple.com/library/archive/documentation/Darwin/Conceptual/FSEvents_ProgGuide/UsingtheFSEventsFramework/UsingtheFSEventsFramework.html#//apple_ref/doc/uid/TP40005289-CH4-DontLinkElementID_11

https://www.jianshu.com/p/7c37b39b143e