protected File workingDirectory = null;

    protected int maxOutputLine = 1000;

    protected long executionTimeout = 30L * 1000L; // 30sec

    protected String commandOutputEncoding = Charset.defaultCharset().displayName();

    protected String[] updateCommand;

    protected String[] deleteCommand;

    protected String[] targetUsers;

    @Override
    public void update(final User user) {

                logger.debug("Thumbnail Command: {}", cmdList);
            }

            final Process p = pb.start();

            final InputStreamThread ist = new InputStreamThread(p.getInputStream(), Charset.defaultCharset(), 0, s -> {
                if (logger.isDebugEnabled()) {
                    logger.debug(s);
                }
            });
            task = new ProcessDestroyer(p, ist, commandDestroyTimeout);