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Do notice, however, that you need to repeat this procedure for every key-secured server with which you want to be able to establish a session Working with keys as described in these steps is an excellent way to make SSH authentication more secure But there s a drawback: if you need to establish an SSH session automatically from a shell script or cron job, it s not very handy if you re first prompted for a key Therefore, some method is needed to execute such jobs automatically One solution is to create a special user account with limited permissions and without a passphrase on its private key Another solution is to run ssh-agent, which caches the keys before they are used, and you ll learn how to do this in the next section..

Scanners may seem like archaic machines that have been superseded by digital cameras or absorbed into multifunction devices, but they re still the best method of transcoding nondigital images and textual documents into a digital format. A lot of flatbed scanners can be made to work under Ubuntu, but not all types are supported. You can check the list of currently supported scanners by visiting www.sane-project.org. Additional models are added to the list all the time, and this is another reason to make sure your system is completely upto-date (see 8, which explains how to update your system software). The best test of whether your scanner is supported under Ubuntu is simply to see whether it will work. Scanning within Ubuntu is handled by the Simple Scan utility. This is a stand-alone program that operates like the TWAIN drivers that you might have used under Windows. To configure a scanner and scan images, follow these steps: 1. Choose Applications Graphics Simple Scan. On startup, the program attempts to detect your scanner. If it finds a compatible model, Simple Scan will start. If the scanner isn t recognized, a dialog box will appear telling you so. Using Simple Scan is as simple as its name suggests. Just lay your original on the scanner and click the Scan button. There s no preview. Simple Scan will go ahead and scan your original at full resolution and display the resulting image. You can then crop, rotate and save the image to disk using the controls in the toolbar. The file types which Simple Scan supports are PNG (lossless), JPEG (compressed), and PDF. Under Document Preferences, you can alter the scan resolution for text and photos, according to your scanner s capabilities, and also set the default page size.

Use WHERE to select a subset of rows before the grouping and aggregating. Use HAVING to select a subset of rows after the grouping and aggregating. Regarding more complex aggregates: Use derived tables where you want to nest aggregates, such as to find the average of counts. Compare counts of rows to do the equivalent of relational division.

Simple Scan should be good enough for most purposes, but if you d like a little more control over your scanning, with capabilities such as adjusting gamma, contrast and brightness, you might consider installing Xsane, which is available in the Ubuntu Software Center.

You can use ssh-agent to save yourself from constantly having to enter private keys. With this program, you can cache keys for a given shell environment. After starting ssh-agent from a shell prompt, you need to add the passphrase for the private key that belongs to it. This is something that you ll do for a specific shell, so, after you close that specific shell or load another shell, you ll need to add the passphrase to that shell again. After adding a passphrase to ssh-agent, the passphrase is stored in RAM, and only the user who added the key to RAM is able to read it from there. Also, ssh-agent listens only to ssh and scp commands that you ve started locally, so there s no way that you can access a key that is kept by ssh-agent over the network. So you can be sure that using ssh-agent is pretty secure. Apart from being secure, it s pretty easy as well. Enabling ssh-agent and adding a passphrase to it is a simple two-step procedure: