* The suffix is trimmed and whitespace is replaced with underscores.
     *
     * @param logSuffix the suffix to append to log file names
     * @return this ExecJob instance for method chaining
     */
    public ExecJob logSuffix(final String logSuffix) {
        this.logSuffix = logSuffix.trim().replaceAll("\\s", "_");
        return this;
    }

    /**