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Simple script to convert opml to markdown

I just put a quick transform script to convert outlines generated by OmniOutliner to MarkDown slide deck. The markdown is specific to Wiki2Beamer flavor.

Here the script code is here.

It is not the best of the XQuery code, but it does the job.

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New version 0.5 of AWS4C released

Here we go again, another version of AWS4C

The new release includes support for S3 delete operation. Check the API Reference and example code in s3_delete.c for details.

The library could be downloaded from here

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Port of RXTX library to Android platform

Just ported a google RXTX library to the Android platform.    Check out the picture below, it shows the Motorola Droid phone talking to the FreeNAS device over the serial port.


Testing android with serial


More information and binaries are here http://v-lad.org/projects/gnu.io.android/.   The source code of port is here  https://github.com/vladistan/gnu.io.android/ .

If you have any questions, comments or support request post them below.



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New version of AWS4C has been released

Just released new version of AWS4C library.

The new release includes support for Reduced Redundancy Storage and some bug fixes related to memory and socket leaks during extended operations.

The library could be downloaded from here:


This release was made possible thanks to the anonymous contributors, who submitted these fixes.

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Slides from Sep 20 Cloud Computing Development Talk

Slides from the talk I gave at UMBC are here. They cover Cloud Computing Development in general and Amazon Web Services in detail.

Feel free to comment.

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Compiling native programs for Android

There is an excellent tutorial by Nirnimesh on how to compile native programs for Android here http://android-tricks.blogspot.com/2009/02/hello-world-c-program-on-using-android.html

Unfortunately things have changed a bit since last year when this post was written. Andy’s agcc script doesn’t work with the most recent Google NDK release 4B.

I have changed the script a little bit to address new path changes. The new script is available here http://android-cruft.googlecode.com/files/agcc-0.2.tgz.

Make sure to add this to your path


where AndroidNDK is your NDK installation directory.

Hope this works for you.

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AWS4C has been updated

Thanks to Henry N. for sending patches to the AWS4C library. I applied and tested them, hence the new release of the library.

Here is the list of changes:

  • The code quality has been improved. Some memory leaks fixed. Also addressed some warnings given by GCC 4.1.2
  • Addressed a bug with having wrong file length after get
  • When debug is not set, don’t print verbose output to stdout
  • Fixed up EU and virtual host URLS
  • Now can set the mime-type for the items
  • Now can attach canned ACL to the items

The library is available at http://code.google.com/p/aws4c/

Have any questions or suggestions write to me ‘tutorials@v-lad.org’ or post your comment here.

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Excellent hadoop ports and filenames reference

There is an excellent hadoop port numbers reference posted by the Cloudera people http://www.cloudera.com/blog/2009/08/14/hadoop-default-ports-quick-reference/.

Hadoop uses a lot of ports to communicate between the nodes and to provide the UI. The quick reference guide make it easier to keep track of what is going on.

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AWS4C a C library that lets you work with AWS

Believe it or not some people need to write programs to access Amazon Web Services in This project grew out of the conversion of my old HPC project to run on the amazon EC2.

I needed a C library to access the code. Unfortunately I couldn’t find any, so I wrote my own.

The code quality sucks, I wrote the whole thing pretty much in one day. And I wouldn’t use it for anything more then a proof of concept projects unless it is heavily reworked to be more robust. But nevertheless it gets the job done.

The library includes bindings for SQS and S3.

It depends on libcurl for its network operations and openssl for the crypto.

There is also libAWS but it is heavily C++ dependent so it wouldn’t work for all types of C projects.

The library is available at http://code.google.com/p/aws4c/

Have any questions or suggestions write to me ‘tutorials@v-lad.org’ or post your comment here.

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Hadoop tutorial for Windows and Eclipse.

Just posted a tutorial on how to configure hadoop environment for Windows using CYGWIN. The tutorial explains how to set-up a hadoop cluster in the pseudo distributed mode and how to get it working with the Eclipse.

If you have any questions / comments / suggestions about this tutorial post them here.

The tutorial is located here.

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