A Journey of a Thousand Miles Begins with a Single Step

Atlas - the authoring system from O'Reilly

Atlas is a wiki-like, git-managed authoring platform for creating books. http://chimera.labs.oreilly.com/books/1230000000065/ch01.html

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zpub - a publishing system for docbook

zpub is a authoring and publishing system for docbook documents. The SCM behind is Subversion. From my understanding it automatically generates the desired output after each commit and notifies interested/involved persons.

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Purge configuration from removed packages

apt-get remove allows to uninstall software packages for Debian and Ubuntu. Some software may still have configuration stored on your system. If you don’t have used apt-get purge, the config files still resides on your Debian installation. This post illustrates how to remove these packages.

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Constructor expressions in JPQL

In JPA it is possible to create directly a new object from JPQL SELECT statement, instead of fetching the result list and mapping the attributes. The JPA supports the constructor expressions for that.

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Query abstract entities

This post demonstrates a part of inheritance with JPA 2. Abstract entities (classes) can be used to query their concrete subclasses.

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uptime - tell how long the system has been running

uptime gives a one line display of the following information. The current time, how long the system has been running, how many users are currently logged on, and the system load averages for the past 1, 5, and 15 minutes.

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