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Want a variable that s set in a script to be available in all subshells Use the export command when Tip

3. 4.

Once we have calculated some aggregates for groups of rows, we may want to ask some questions about the results. For example, in Figure 8-7, we have found the number of entries in each tournament in each year. A likely question is Which tournaments had three or more entries Looking at the result table in Figure 8-7, we want to select just those rows with the count greater or equal to 3. We can do this with the HAVING keyword. Take a look at Listing 8-24.

Provide a name for the new connection. Then select the IPv4 Settings tab and change the Method drop-down from DHCP to Manual. Click Add and supply the IP address, subnet mask, and gateway address for the device. You should also fill in the areas for DNS Servers and Search Domains. You can add more than one address to these sections by separating each one with a comma. Figure 7-4 shows an example of these settings. Click Apply after filling in the information. The network will be added to the list.

defining the variable. However, there s no way to define a variable in a subshell that will be set in the parent shell as well.

Figure 7-4. Ubuntu will automatically work with DHCP networks, or you can define a static IP address.

Tip If you re using a static IP address with a router, such as that provided by a DSL modem, the DNS address is often the same as the router/gateway address.

Listing 8-24. Find Tournaments with Three or More Entries SELECT TourID, Year, COUNT(*) AS NumEntries FROM Entry GROUP BY TourID, Year HAVING COUNT(*) >= 3

The second method to execute a script is with the source command. This command is referred to by entering a dot, followed by a space and the name of the script. For example, our script with the name hello can be started with . hello. The important difference with the source command is that no subshell is started and the script runs directly from the current shell. The result is that all variables that are defined when running the script are available after running the script as well. This can be both useful and confusing. The source method is often used to include another script in a generic script. In this other script, for example, some system variables are set. Listing 7-3 shows how this works in the script that starts networking: /etc/init.d/networking. As you can see in about the approximate middle of the listing, the command . /lib/lsb/init-functions is included to set some generic functions that should be used in this script. Listing 7-3. The Sourcing Method Is Used to Included Scripts Containing Variables in Many Startup Scripts. #!/bin/sh -e ### BEGIN INIT INFO # Provides: # Required-Start: # Required-Stop: # Default-Start: # Default-Stop: ### END INIT INFO

Your network connection should now work. If you now have more than one wired network connection set up, you can switch between them by clicking on the NetworkManager icon and selecting the appropriately named connection under Wired Networks. If your newly set up connection isn t working, try rebooting. However, if your system administrator mentioned that a proxy must also be configured, you ll need to follow the instructions in the Working with a Proxy Server section later in this chapter.

A wireless (wi-fi) network is, as its name suggests, a network that does away with cabling and uses radio frequencies to communicate. It s more common for notebooks and handheld computers to use wireless connections, but some desktop computers also do. Indeed, it s increasingly the case that many workplaces are switching to wireless networking, eschewing old-fashioned, cable-based networking.

PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin" [ -x /sbin/ifup ] || exit 0 . /lib/lsb/init-functions