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The boot loader menu you see when your PC is set to dual-boot has three or four choices, as shown in Figure 6-1. The top one is what you need to boot Ubuntu. The Ubuntu option will be selected automatically within 10 seconds, but you can press Enter to start immediately.

Listing 8-1. Return the Number of Members in the Club SELECT COUNT(*) AS NumMembers FROM Member Listing 8-2. Return the Number of Women in the Club SELECT COUNT(*) AS NumWomen FROM Member WHERE Gender = 'F'

Apart from adding an IP address to a network board, you can use the ifconfig command to bring a specific network board up or down. For example, ifconfig eth0 down shuts down the interface, and ifconfig eth0 up brings it up again with its default settings as specified in the configuration file /etc/network/interfaces. Instead of using ifconfig to manipulate your network card, you can also use ifup and ifdown. These commands allow you to bring a network card up or down easily, and without changing the configuration of a given network board. For example, to bring a network board down, use ifdown eth0; to bring it up again, use ifup eth0. In both cases, the default configuration for the network board as specified in /etc/network/interfaces is applied.

Figure 6-1 The default choice is fine on the boot menu, so press Enter to start Ubuntu You should find that you also have an entry for Windows, located at the bottom of the list and labeled with whichever version of the OS you have installed To boot into Windows, simply use the cursor keys to move the selection to the appropriate option and then press Enter You should also see an entry ending in (recovery mode) This is a little like Safe Mode within Windows If you select recovery mode, Ubuntu will boot to a text mode menu with six options: resume Resume normal boot: This option allows you to boot normally, as if you didn t need to fix anything at all.

However, the big difference with this option compared to a graphical boot is that Ubuntu boots in text mode, in which system messages scroll past as Ubuntu is starting up If you have problems with booting Ubuntu, you can run in recovery mode and choose this option to find error messages in the boot process clean Try to make free space: This option forces the boot loader to try to make free space on the disk dpkg Repair broken packages: This option tries to repair the software installed on your computer Grub Update Grub loader: Forces Grub (the program that presents you this boot menu) to query the operating systems installed in your hard disks and to recreate the list it presents at startup netroot Drop to shell prompt with networking: Like the option root but with the networking features fully functional.

script will run, no matter what shell environment you re currently in as a user. Listing 7-1 shows an example of a script that starts with a shebang. Listing 7-1. Shell Scripts Should Always Start with the Shebang. #!/bin/bash # # myscript [filename] # # Use this script to....

Listing 8-3. Return the Number of Members Who Are Not Women SELECT COUNT(*) FROM Member WHERE Gender <> 'F'

root Drop to root shell prompt: This option boots with conservative system settings and then presents you with a command-line prompt in administrator mode (you run as the root user a special user account that has absolute power over the entire system, so try to avoid booting to this option if you can do so, and be very careful when you don t have any other option but to use the.