Digest

The digest program returns a message digest for one or more files.

Example Usage

We list a few examples of the digest command here to illustrate its usefulness and ease of use. To get started, lets compute the message digest of these files:

  digest README.txt digest.rdf

Where digest.rdf looks something like this:

<?xml version="1.0"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
         xmlns:digest="http://urban-warrior.org/WizardsToolkit/digest/1.0/">
  <rdf:Description rdf:about="README.txt">
    <digest:timestamp>2009-01-23T12:25:47-05:00</digest:timestamp>
    <digest:modify-date>2007-08-25T20:19:02-04:00</digest:modify-date>
    <digest:create-date>2007-08-25T20:19:02-04:00</digest:create-date>
    <digest:extent>11476</digest:extent>
    <digest:sha256>78709afc0de69f51085675329dc44c8b475258c1e7fd29acea078347e641a020</digest:sha256>
  </rdf:Description>
</rdf:RDF>

To determine if any files have been changed, use this command:

  digest -authenticate digest.rdf -

Only files that fail to authenticate are listed. Notice the dash at the end of the command line, a dash means print the output to the terminal.

Option Summary

The digest command recognizes these options. Click on an option to get more details about how that option works.

Option	Description
-authenticate	read message digests from a file and authenticate them
-debug events	display copious debugging information
-hash type	compute the message digest with this hash
-help	print program options
-log format	format of debugging information
-version	print version information