In other words, overwriting the hard drive many times is just a waste of time. Writing 0:s on the whole hard drive is sufficient and can be done with tools like dd.

More information:

http://www.h-online.com/newsticker/news/item/Secure-deletion-a-single-overwrite-will-do-it-739699.html

void FillRect(int x, int y, int w, int h, int color) {
SDL_Rect rect = {x,y,w,h};
SDL_FillRect(screen, &rect, color);
}

I want to add a 100×150 rectangle at the position (25,25) with the color white.

FillRect(25,25,100,150,0xFFFFFF);

Great, no more headache and code memorizing.

I want to add tiles fast and be able to hold the mouse key down, instead of clicking every time I want to add a tile.

Mouse states

int cx,cy;
Uint8 ms = SDL_GetMouseState(&cx, &cy);
if (ms & SDL_BUTTON(SDL_BUTTON_LEFT)) {
// the left mouse key is pressed
} else if (ms & SDL_BUTTON(SDL_BUTTON_RIGHT)) {
// the right mouse key is pressed
}

1. Create the environment variabel PKG_PATH with the value of the right directory to fetch the packages.
export PKG_PATH=ftp://ftp.openbsd.org/pub/OpenBSD/4.5/packages/i386/

2. Add this line into the startup file, ~/.profiles so we don’t have to export it every time we use pkg.

Installing a package
pkg_add -i firefox

Removing a package
pkg_delete firefox

Information about installed packages
pkg_info

/etc/fstab
/dev/sda1 /media/windows ntfs-3g defaults 0 0

ssh -Y -l user server

There’s a plugin called pidgin-otr (Off-the-Record messaging) which allows you to encrypt your conversations (assuming the other part also has pidgin-otr installed). Regretfully, people never seems to care about encryption even if they seem to get close to crazy if someone invades their privacy, quite the paradox… Well that’s just another story which i’m not going to post here, as i’m just spreading the word about everything that’s good : )

The Off-the-Record messaging plugin uses public and private keys. It’s very easy to use. Just download the plugin, activate it in the Pidgin add-on menu and generate a key. In the conversation window, a button will appear that makes it easy to toggle encryption on/off.

Download Pidgin from: http://www.pidgin.im/download/
Download Pidgin-otr from: http://www.cypherpunks.ca/otr/index.php#downloads

The Thunderbird add-on Enigmail, provides an “back-end” interface to GnuPG so the user can use Thunderbird to encrypt/decrypt mail. After installing Enigmail, generate a keypair. This will create a public and private key for the current account. The public key is meant to be distributed so other people can send mail encrypted to you. The private key however, is important NOT to distribute. Since it is used to encrypt the messages sent to you with your public key. The public key is usually uploaded to a keyserver.

It’s possible to search for public keys on the keyservers and add public keys into a local list and configure Thunderbird to encrypt all messages by default (supposing the public key to the person in question is added into your key list). Both Thunderbird, GnuPG and Enigmail, are very useful indeed : )

For more information about GnuPG and Enigmail:
http://www.gnupg.org/
http://enigmail.mozdev.org/home/index.php

g++ -o appname opengl.cpp `sdl-config –libs –cflags` -lGL -lGLU

sdl-config –libs –cflags is used to get the library path and include path for SDL. This can be used instead of manually specifying the libraries for SDL.

Format disc where /dev/dvd is the device name:

dvd+rw-format -force /dev/dvd

Burn the directory (/home/user/stuff) onto the DVD:

growisofs -Z /dev/dvd -R -J /home/user/stuff

More information:
http://fy.chalmers.se/~appro/linux/DVD+RW/