Nutch is an open source web-search software. It builds on Lucene and Solr, adding web-specifics, such as a crawler, a link-graph database, parsers for HTML and other document formats, etc. Nutch is an effort to build a Free and Open Source search engine. It uses Lucene for the search and index component. The fetcher (robot) has been written from scratch solely for this project.
If you have a user account that cannot make sudo command then it because it is not in sudoers list. You must add the user to sudoers list to allow sudo command. Sudoers list is located in /etc/sudoers
So open up the file with visudo command. You must use this command to edit this
burhan@burhan-desktop:$ sudo visudo
If you want to set user permission like root user add it below
# User privilege specification root ALL=(ALL) ALL
If you forget the root user password you can change with a simple tricky command in ubuntu. Login to your regular account. You should have the sudo comman available for your user account.
Now open the terminal and enter the command
sudo passwd
This will let you to change root account password as you used sudo! Now enter the new password and confirm. Yes! You are done 
It is very easy to create new user account in ubuntu using terminal. Just follow adduser and addgroup command.
Here is an example
I want to create a user named "nutch" with a new "nutch" user group. Here is how I did it.
First create the user group
burhan@burhan-desktop:/usr/share$ sudo addgroup nutch Adding group `nutch' (GID 1002) ... Done.
Now create the user account within the user group
Hadoop is a distrubuted file system allowing to use hundreds or thousands of computers as nodes to build powerful cluster of computers. This is based on google map reduce paper. This will demonstrated you step step by on Implementing hadoop on Ubuntu.
Some common problems during hadoop setup and solutions discussed below
MapReduce is a patented software framework introduced by Google to support distributed computing on large data sets on clusters of computers.
http response codes are some numbers sent to browser from server each a http request is made. Each of them has different meanings. They tells you how server response to the request url. Here is a details of all the available http codes.
Jcrop is the quick and easy way to add image cropping functionality to your web application. It combines the ease-of-use of a typical jQuery plugin with a powerful cross-platform DHTML cropping engine that is faithful to familiar desktop graphics applications.
