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Ubuntu includes a feature called readahead, which is able to order the list of files to be loaded during bootup by their locations on the hard disk. A default readahead list is installed on a standard Ubuntu installation. This is created on a generic PC, but you can build your own version of the list, customized for your own computer. Here are the steps to create your own readahead list: 1. Reboot Ubuntu, and at the boot menu, highlight the Ubuntu entry and press E. If Ubuntu is the only operating system on your computer (that is, your computer doesn t dual-boot with Windows), you might need to press Shift to see the boot menu when prompted. Highlight the line, beginning with the word linux and press E again. Using the right-arrow key, move the cursor to the end of the line. Insert a space and type profile. The following is how the entire line read on our test PC; yours may be slightly different (note that the beginning of the line was cropped off because of the resolution of the screen):

Therefore, even if ReiserFS has some nice technical features, you should not depend on it too much Like Ext2 and Ext3, ReiserFS also has some management utilities Here s a short description of these tools, including some of the most interesting options: reiserfsck: The reiserfsck tool is used to check the consistency of a Reiser file system, and it has some powerful repair options One of them is --rebuild-sb, which stands for rebuild superblock Use this option when you get the error read super_block: can t find a reiserfs file system Another option is the --rebuild-tree option, which hopefully you won t see too often This option is required when reiserfsck wasn t able to repair the file system automatically because it found some serious tree inconsistencies Basically, the --rebuild-tree option will rebuild the complete B-tree database.

Perhaps the most important differences between Linux and Windows are the following: The Linux file system doesn t use drive letters. The Linux file system uses a forward slash (/) instead of a backslash (\) in filename paths.

In other words, something like /home/john/myfile is typical in Ubuntu, as opposed to C:\Documents and Settings\John\myfile in Windows. The root of the hard disk partition is usually referred to as C:\ in Windows. In Ubuntu, it s referred to simply with a forward slash (/). If you have more than one drive, the drives are usually combined into one file system under Linux. This is done by mounting, so that any additional drives appear as virtual folders under the file system. In other words, you browse the other hard disks by switching to various directories within the main file system.

Before using this option, always make a backup of the complete partition where you are running it and never interrupt the command; doing so will definitely leave you with an inaccessible file system reiserfstune: The reiserfstune command can be used for several purposes Basically, you use it to tune options with regards to the Reiser journal, but you can also use it to set a UUID and a label that allow you to mount the file system without being dependent on the name of the device where it resides This command has some interesting options as well One of them is the -j option that allows you to specify the journal device you want to use.

Inner queries that return a single value are often useful in the situation of a simple select operation to retrieve a subset of rows. Let s consider the handicaps of our members, as shown in Figure 4-5.

Note If you re used to Mac OS X, the Ubuntu file system shouldn t come as much of a surprise, because both

Another important difference between Ubuntu and Windows is that filenames in Ubuntu are case sensitive. This means that MyFile is distinctly different from myfile. Uppercase letters are vitally important. In Windows, filenames might appear to have uppercase letters in them, but these actually are ignored when you rename or otherwise manipulate files. Because of this case sensitivity, you could have two separate files existing in the same place, one called MyFile and another called myfile. In fact, you could also have myFile, Myfile, MYFILE, and so on, as shown in Figure 10-8. As with Windows, filenames can have spaces within them. This means it s possible to have file or folder names like Pictures from Disneyland or party at bob's house.jpg.

This option makes it possible to separate the Reiser journal from the actual file system; it s a very useful option if you want to avoid a situation where a single-point failure can render your system inaccessible Another interesting option that can be used with reiserfstune is the option -l that allows you to specify a label for the file system This label can be used when mounting the file system and thus increases your flexibility when working on the file system..

Note You might notice that some Linux old-hands avoid using spaces in filenames and use an underscore

If we want to find those members with a handicap less than 16, then this can be done simply with the SQL in Listing 4-13.