Go back to fronty page View most popular entries View latest additions Submit tutorials to UnixTutorials.info
UnixTutorials logo

Search results for How To: Back up your DVDs in Ubuntu

Unix+clones

Optimizing C/C++ programs using the GProf profiler

Post date: May 24, 2005, 18:05 Category: Optimizing Views: 6530 Comments
Tutorial quote: One of the most important things to keep in mind while optimizing an application is: optimize where it counts. It is no use to spend hours optimizing a piece of code that usually runs for only 0.04 seconds anyway.

GProf provides a surprisingly easy way to profile your C/C++ application and spot the interesting pieces right away. A small case study shows how GProf was used to reduce the running time of a real-world application from over 3 minutes to under 5 seconds, by identifying 2 data structures as important and optimizing those.

Historically, the program goes back as far as 1982, when it was introduced on the the SIGPLAN Symposium on Compiler Construction. It is now a standard tool available on virtually all flavors of UNIX.
Ubuntu

How to Upgrade Ubuntu 8.10 (Intrepid) to Ubuntu 9.04 (Jaunty)

Post date: April 24, 2009, 06:04 Category: System Views: 3696 Comments
Tutorial quote: The Ubuntu team is pleased to announce Ubuntu 9.04 Desktop and Server editions and Ubuntu Netbook Remix, continuing Ubuntu’s tradition of integrating the latest and greatest open source technologies into a high-quality, easy-to-use Linux distribution.This tutorial will explain how to Upgrade Ubuntu 8.10 (Intrepid Ibix) to Ubuntu 9.04 (Jaunty Jackalope) released on the 23rd March 2009.

Debian

Preventing MySQL Injection Attacks With GreenSQL On Debian Etch

Post date: October 28, 2008, 12:10 Category: Security Views: 3688 Comments
Tutorial quote: GreenSQL (or greensql-fw) is a firewall for MySQL databases that filters SQL injection attacks. It works as a reverse proxy, i.e., it takes the SQL queries, checks them, passes them on to the MySQL database and delivers back the result from the MySQL database. It comes with a web interface (called greensql-console) so that you can manage GreenSQL through a web browser. This guide shows how you can install GreenSQL and its web interface on a Debian Etch server.
BSD

Firewalling with OpenBSD's PF packet filter

Post date: April 19, 2005, 02:04 Category: Network Views: 6446 Comments
Tutorial quote: PF operates in a world which consists of packets, protocols, connections and ports.

Based on where a packet is coming from or where it's going, which protocol, connection of port it is designated for, PF is able to determine where to lead the packet, or decide if it is to be let through at all.

It's equally possible to direct network traffic based on packet contents, usually referred to as application level filtering, but this is not the kind of thing PF does. We will come back later to some cases where PF will hand off these kinds of tasks to other software, but first let us deal with some basics.

We've already mentioned the firewall concept. One important feature of PF and similar software, perhaps the most important feature, is that it is able to identify and block traffic which is you do not want to let into your local network or let out to the world outside. At some point the term 'firewall' was coined.
Ubuntu

Upgrade Ubuntu 8.10 (Intrepid) to Ubuntu 9.04 (Jaunty) Beta

Post date: March 30, 2009, 07:03 Category: System Views: 3369 Comments
Tutorial quote: Ubuntu 9.0 is the upcoming version of the Ubuntu operating system. The common name given to this release from the time of its early development was “Jaunty Jackalope”.This tutorial will explain how to upgrade ubuntu 8.10 to ubuntu 9.04 beta.

Unix+clones

X Window Manager Benchmarks (E17 on Top)

Post date: June 9, 2005, 14:06 Category: Benchmarks Views: 3733 Comments
Tutorial quote: I've been focusing on some stability issues of late in E17, but more importantly - speed. I've been doing a little profiling and shaving off cycles where I can find readily optimizable code. I have E17 starting in 0.52 seconds (from execute to usable desktop). Considering that involves loading and rendering and scaling a complex multi-leayered desktop background, loading multiple useful modules (pager, ibar, start, dropshadow, cpufreq handler, clock, etc.), then that's not too bad.

Now I'm a numbers man. I like numbers. I don't like vague "it's faster than X" or "that's slower than this" statements without numbers to back it up. I also like to play fair. Also given there are no "performance suites" i know of that measure window manager performance, I wrote a quick and dirty one.
Debian

Version Control For Your /etc Directory With etckeeper/Bazaar On Debian Squeeze

Post date: July 17, 2011, 18:07 Category: Miscellaneous Views: 2432 Comments
Tutorial quote: This tutorial explains how you can store the contents of your /etc directory in a version control system (VCS) with the help of etckeeper on Debian Squeeze. etckeeper hooks into Debian's package manager apt so that whenever you install/remove a package with apt, etckeeper will commit all changes to the /etc directory to your VCS; it also tracks file metadata such as permissions which is important for files such as /etc/shadow. Using etckeeper, you can go back to a previous version of /etc if an update has overwritten valuable configuration files. Not only will etckeeper track apt's changes to /etc, it will also do a daily auto-commit so that your manual changes go to VCS as well; in addition to that, you can do commits at any time manually.
Ubuntu

Installing Xen On An Ubuntu 8.04 Server From The Ubuntu Repositories

Post date: May 8, 2008, 10:05 Category: Installing Views: 3021 Comments
Tutorial quote: This tutorial provides step-by-step instructions on how to install Xen on an Ubuntu Hardy Heron (Ubuntu 8.04) server system (i386). You can find all the software used here in the Ubuntu repositories, so no external files (apart from a fixed Ubuntu Xen kernel to enable networking for the virtual machines) or compilation are needed.
Ubuntu

The Perfect Desktop - Ubuntu Studio 7.04

Post date: May 16, 2007, 00:05 Category: Desktop Views: 4795 Comments
Tutorial quote: Ubuntu Studio is a special Linux distribution tailored to the needs of audio, video, and graphic enthusiasts or professionals. Because Ubuntu Studio is based on Ubuntu, you are not limited to this area, but can install any application that is available for Ubuntu, thus turning Ubuntu Studio into a normal desktop for everyday use. This tutorial shows how you can turn Ubuntu Studio 7.04 into a full-fledged replacement for a Windows desktop. The advantages are clear: you get a secure system without DRM restrictions that works even on old hardware, and the best thing is: all software comes free of charge.
Ubuntu

Tweaking Hidden Ubuntu Settings With Ubuntu Tweak

Post date: January 29, 2008, 12:01 Category: Desktop Views: 3986 Comments
Tutorial quote: Ubuntu Tweak is a tool that lets you change hidden Ubuntu settings, for example: hide or change the splash screen, show or hide the Computer, Home, Trash, and Network icons, change Metacity, Nautilus, power management, and security settings, etc. Currently Ubuntu Tweak is available only for the Ubuntu GNOME desktop, i.e., it will not work on Kubuntu or Xubuntu. This short guide shows how to install and use Ubuntu Tweak.
Web-based applications and online marketing solutions - LumoLink