UDID using java

gistfile1.txt

	private static final int IOS_UDID_LENGTH = 40;
	String commandforUDID = "system_profiler SPUSBDataType | sed -n -E -e '/(iPhone|iPad|iPod)/"
            + ",/Serial/s/ *Serial Number: *(.+)/\\1/p'";
	String testDevice = "idevice_id -l";
	List<String>iOSUDID = new LinkedList<String>();
public List<String> getUDIDS(){
		try {
			int startPos = 0;
			int endPos = IOS_UDID_LENGTH - 1;
			Optional<String> getIOSDeviceID = Optional.of(executeTerminalCommand(commandforUDID));
			while (endPos < getIOSDeviceID.get().length()) {iOSUDID.add(getIOSDeviceID.get().substring(startPos, endPos + 1) .replace("\n", ""));
            startPos += IOS_UDID_LENGTH;
            endPos += IOS_UDID_LENGTH;
        }
    } catch (IOException e) {
        e.printStackTrace();
        throw new IllegalStateException("Failed to fetch iOS device connected");
    }
    
    public String executeTerminalCommand(String command) throws IOException{
        BufferedReader br = executeCommandonTerminal(command);
        String line;
        String allLine = "";
        while ((line = br.readLine()) != null) {
            allLine = allLine.trim() + "" + line.trim() + "\n";
        }
        return allLine.trim();
    }
	
    public BufferedReader executeCommandonTerminal(String command) throws IOException {
        List<String> commands = new ArrayList<>();
        commands.add("/bin/sh");
        commands.add("-c");
        commands.add(command);
        ProcessBuilder builder = new ProcessBuilder(commands);
        final Process process = builder.start();
        InputStream is = process.getInputStream();
        InputStreamReader isr = new InputStreamReader(is);
        return new BufferedReader(isr);
    }