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Any user who needs to log in to your server needs a shell. (Conversely, users who don t need to work on your server directly generally don t need a shell; they just need a connection.) The shell will enable the user s commands to be interpreted. The default shell in Ubuntu is /bin/ bash, a shell that offers many features. However, you should know that not every user needs a shell. A user with a shell is allowed to log in locally to your system and access any files and directories stored on that system. If you re using your system as a mail server (and so all that your users need is to access their mail boxes with the POP protocol), it makes no sense at all to give them a login shell. Therefore, you could choose to specify an alternative command to be used as the shell. For example, use /bin/false if you don t want to allow the user any local interaction with your system. Any other command will do as well. If, for example, you want the Midnight Commander (a clone of the once very popular Norton Commander) to be started automatically when a user logs in to your system, make sure that /usr/bin/mc is specified as the shell for that user.

You ll also need to know if the card uses a driver module that s compatible with wpasupplicant, the software that handles WPA management under Ubuntu. As this book went to press, wpasupplicant was compatible with the following wireless drivers: HostAP, Prism54, Madwifi, Atmel, wext, NdisWrapper, and ipw. You can discover which driver your card uses through Ubuntu s Device Manager. Open Device Manager (System Administration Device Manager) and look for your wireless card in the list of hardware on the left side of the window. Once you find it, select it, and then click the Advanced tab on the right side of the window. Find the line that reads info.linux.driver, and look in the Value column for the name of the driver. If what you discover isn t in the list of compatible drivers, then wpasupplicant won t work with your card. If it is present, make a note of the name of the driver, because you ll need to know it to complete the configuration. Finally, you ll need to know how Ubuntu refers to your wireless card. Open the Network Settings applet (System Administration Networking) and look for the entry in the list referring to your wireless card. It should read, The interface for x is active/not configured, where x will be eth0, ath0, or wlan0 (or possibly something else). Whatever the case, make a note of it for later use.

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environment for a user. If you don t know the complete path for your favorite command, use the which command. For example, which mc shows the exact location of the program file you re looking for. Not installed yet Use sudo apt-get install mc to install it now.

Note There s a chance that wpasupplicant will support more drivers than those I ve listed by the time you read this. With the version I used, I could find out which drivers were supported by viewing the help documentation that appeared when I typed wpasupplicant, without any command options, in a GNOME Terminal window.

Open a New Query window in SSMSE (remember to make Northwind your query context). Enter the following query and click Execute. You should see the results shown in Figure 4-17. select o.orderid OrderID, c.companyname CustomerName, e.lastname Employee from orders o inner join employees e on o.employeeid = e.employeeid inner join customers c on o.customerid = c.customerid

If your user really needs to do something on your system, she needs a password. By default, login for the users you create is denied, and no password is supplied. Basically, your freshly created user does not have any permissions on your server. However, the simple passwd command will let her get to work. If the user uses the command to change her password, she will be prompted for the old password and then the new one. It s also possible for the root user to change passwords as well. Only root can add the name of a user, for whom root wants to change a password, as an argument to the passwd command. For example, root can use the command passwd linda to change the password for user linda, which is always useful in case of forgotten user passwords.

To install the wpasupplicant software, first configure the Synaptic Package Manager to access Ubuntu s online software repositories. This is necessary to download the wpasupplicant software package. If you haven t already set up online repositories, see the Setting Up Online Software Repositories section later in this chapter. Once that s completed, return here. Obviously, you ll need to find some way of getting online to do be able to download using the Synaptic Package Manager. Consider making a direct Ethernet connection to your router, or simply turn off WPA on the router for the duration of the download. Follow these steps to configure WPA: 1. Select System Administration Synaptic Package Manager. 2. Click the Search button. Enter wpasupplicant as a search term.

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