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When using any of these regular expressions, it is always a good idea to put the search pattern between single quotes. The single quotes tell the shell not to interpret anything in the regular expression, so that grep can do the interpretation. So use grep '\<linda' * and not grep \<linda *. Let s examine some examples with this. To show how it works, consider the name poem file in Listing 2-7. Listing 2-7. Example Text File blah ra dala ma na na blahra dala ma nana narablah naka dala ma ka ka radalamanablah Listing 2-8 shows the result of the different regular expressions. Listing 2-8. Example of Regular Expression Usage sander@RNA:~$ grep '^blah' poem blah ra dala ma na sander@RNA:~$ grep 'blah$' poem ka ka radalamanablah sander@RNA:~$ grep '\<blah' poem blah ra dala ma na na blahra dala ma nana sander@RNA:~$ grep 'blah\>' poem blah ra dala ma na narablah naka dala ma ka ka radalamanablah sander@RNA:~$ grep '\<blah\>' poem blah ra dala ma na As you can see, in the first example line (grep '^blah' poem), grep locates only those lines that start with the text blah , which produces one match only. Next, grep 'blah$' poem is used to find lines that end with the text blah . Following that, grep '\<blah' poem is used to find all lines that contain a word that starts with the string blah . Next, you can see that grep 'blah\>' poem finds all words that end with the poem string. Finally, the command grep '\<blah\>' poem finds only those lines in which blah occurs as a word on its own.

It s easy to switch backgrounds under Ubuntu. You can also add your own images and set background size, or select a background color if you don t wish to use an image. These changes can be made from the Background tab of the Appearance Preferences dialog box (System Preferences Appearance), as shown in Figure 9-4.

As well as retrieving a subset of rows and columns from a table, we can also use SQL queries to retrieve some statistics. There are SQL functions that allow us to count records, total or average values, find maximum and minimum values, and so on. In this section, we will look at some simple queries for counting records. (We will return to this topic in 8.)

Figure 9-4. Backgrounds can be zoomed or scaled to fill the screen by using the Style drop-down list (this figure includes backgrounds from the package).

The last file management task discussed in this section is the option to create empty files, which can be very useful for testing purposes when you need a file to exist but without necessarily having any contents. The touch command will do just that. For example, touch somefile will create a zero-byte file with the name somefile in the current directory. You should be aware that it was never the purpose of touch to create empty files. The main purpose of the command is to open a file so that the last access date and time of the file that are displayed with ls are modified to the current time. For example, touch * will set this time stamp to the present date and time on all files in the current directory. If, however, touch

On the Background tab, you can select from a short list of images. You can choose any of the installed images or, by selecting the thumbnail at the top left, opt for no image at all. In the case of the latter, you can use the drop-down toward the base of the window to choose the color background style (detailed in the following options), and the colors to include by using the selector(s). You have the following options: Solid color: This option fills the desktop with one uniform color. You are provided one color button to set the color. Horizontal gradient: This option fills the desktop with one color on the left, blending with another color from the right. You are provided two color buttons to specify both colors. Vertical gradient: This option fills the desktop with a color on top, blending with another color at the bottom. You are provided two color buttons to specify both colors. To specify the color or colors that will be used, click the color buttons beside the Colors drop-down list. The Pick a Color dialog box will appear. Select a color by clicking or dragging the color wheel. You can also use the eyedropper tool to obtain any color displayed on your screen, including anywhere on the desktop or in open windows. Simply click the tool on the color.