In this example, we will describe how to backup the files or contents of a home directory on an Ubuntu 11.04 operating system to an encrypted file system on an external hard disk or storage device for the USB port.
We will use the Linux Unified Key Setup (LUKS) to create the encrypted file system on [...]

In the Ubuntu operating system, you can use keyboard shortcuts to insert special characters, such as the check mark symbol (✔) or the Euro currency symbol ().
In this example, we will use the keyboard shortcut to insert the check mark symbol in this article.
We open the Special Characters application. This can be opened from OpenOffice [...]

On many internet forums, you will find users of the Dell Laser Printer 1710n, that reports, that the printer will not print. On the homepage of the printer, the following error message is shown. The message remains the same even after inserting a new cartridge.
31 Missing or Defective Cart
The solution is to open the front [...]

recoverjpeg is a tool, that identify JPEG pictures on a file system, such as a file system on a SD memory card, that is used in digital cameras.
In the following example, an Ubuntu operating system, recoverjpeg and a card reader is used to recover pictures on a SD memory card.
sudo recoverjpeg /dev/sdb
The recovered pictures are [...]

If unexpected packets arrive at the wrong interface, then the FreeBSD operating system will fill the system log with messages like the following. These messages will also fill the security output and kernel log messages.
arp: 192.168.1.1 is on lo0 but got reply from 00:19:cb:f9:12:34 on xl0
arp: 192.168.1.1 is on lo0 but got reply from 00:19:cb:f9:12:34 [...]