private boolean isNumeric(final String a) {
            for (int i = 0; i < a.length(); i++) {
                if (!Character.isDigit(a.charAt(i))) {
                    return false;
                }
            }
            return true;
        }
Recursively search the specified path and list TIFF files and metadata.
<p>
Command-line Arguments:
</p>
<ol>
<li>Top-level directory (mandatory)</li>
<li>Output file for results (optional)</li>
</ol>
If the optional output file has the extension ".csv", the output will be formatted as a comma-separated-value file suitable for inspection in Excel.
src/test/java/org/apache/commons/imaging/examples/tiff/SurveyTiffFolder.java