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I refer to this article： https://developer.apple.com/forums/thread/129752 extension Cmd {   static func launch(tool: URL, arguments: [String], completionHandler: @escaping (Int32, Data) -> Void) throws {     let group = DispatchGroup()     let pipe = Pipe()     var standardOutData = Data()     group.enter()     let proc = Process()     proc.executableURL = tool     proc.arguments = arguments     proc.standardOutput = pipe.fileHandleForWriting     proc.terminationHandler = { _ in       proc.terminationHandler = nil       group.leave()     }     group.enter()     DispatchQueue.global().async {       // Doing long-running synchronous I/O on a global concurrent queue block       // is less than ideal, but I’ve convinced myself that it’s acceptable       // given the target ‘market’ for this code.       let data = pipe.fileHandleForReading.readDataToEndOfFile()       pipe.fileHandleForReading.closeFile()       DispatchQueue.main.async {         standardOutData = data         group.leave()       }     }     group.notify(queue: .main) {       completionHandler(proc.terminationStatus, standardOutData)     }     try proc.run()     // We have to close our reference to the write side of the pipe so that the     // termination of the child process triggers EOF on the read side.     pipe.fileHandleForWriting.closeFile()   } } run shell : try Cmd.launch(tool: URL(fileURLWithPath: "/usr/bin/which"), arguments: ["docker"]) { (status, outputData) in         let output = String(data: outputData, encoding: .utf8) ?? ""         print("done, status: \(status), output: \(output)")       } the result print： done, status: 1, output:  i had remove sandbox and use this code in my mac app. and return value is empty string. I tried running this script using https://github.com/kareman/SwiftShell and got the same result