In the past few articles in the Python series, we’ve learned a lot about working with regular expressions in Python.

In this article, we’ll explain how we could use python regular expressions for a realistic task.

We’ll do a step by step walk through on how we can build Python data structures from formatted flat text files.
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How to Add Multiple Routes in Linux Using ip Command Examples

by Karthikeyan Sadhasivam on August 21, 2014

Apart from the default route, you can also configure additional routes.

For example, your server you might have 2 interfaces (eth0 and eth1). By default, all the traffic is routed through interface eth0 irrespective of what IP address you have configured on eth1.

To route the incoming and outgoing traffic through eth1, other than the default route (eth0), you also need to add additional routes for eth1 .
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15 aptitude Command Examples for Package Management in Linux

by Balakrishnan Mariyappan on August 11, 2014

For Debian based systems like Ubuntu, you can use aptitude command for package management from the command line.

This article explains several aptitude command examples including the following:

  • Install a specific version of a package
  • Install multiple packages using pattern
  • Search for a package using pattern
  • Get packages under a section
  • Don’t update a specific package (Using hold and keep)
  • Mark a package with a specific install type
  • Perform system update
  • Perform safe upgrade

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Most software products usually have a programmatic automation of input and output interface, which facilitate the monkey test.

With these interface, the product can be fully tested under various user input conditions.
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There are three types of cryptography techniques :

  1. Secret key Cryptography
  2. Public key cryptography
  3. Hash Functions

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10 insserv Command Examples for Linux System Init Scripts

by Karthikeyan Sadhasivam on August 6, 2014

insserv command is used to control the start and stop order of the services that are on a Linux system.

It enables an installed system init script (boot script) by reading comment header of the init script and calculating the dependencies between all the scripts.

Insserv scans for the system facilities in the configuration file /etc/insserv.conf and the directory /etc/insserv.conf.d.
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How to Record Audio and Save as MP3 File using Audacity

by Balakrishnan Mariyappan on August 5, 2014

Audacity is an open source software for manipulating audio. The following are few important features of audacity:

  • Record live audio
  • Playback recorded audio/sound files
  • Edit sound files by cut, copy & paste.
  • Convert audio from one format to another

Apart from Linux you can also install Audacity on Windows and Mac OS X.

This article explains few essentials features of audacity with screenshots.
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15 EMC Navisphere CLI Command Examples with NaviSecCLI

by Karthikeyan Sadhasivam on August 4, 2014

emcNavisphere CLI is a command line interface tool for EMC storage system management.

You can use it for storage provisioning and manage array configurations from any one of the managed storage system on the LAN.

It can also be used to automate the management functions through shell scripts and batch files.
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