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On Ubuntu Server, visudo uses the text editor nano by default. If you are a Linux veteran who is Tip used to Vi, you ll probably won t like this. Want to use Vi instead of nano Then use the command export VISUAL=vi. Like what you see Put it as the last line in /etc/profile and, from now on, every time that you use either visudo or edquota, Vi is started instead of nano. In this book, I m using the Vi alternative because it automatically saves all files in the locations where they have to be saved.

The query could also be constructed from an algebra perspective, as shown in Listing 6-9, if you prefer this approach.

In the context of file management at the command-line prompt, the tilde refers to a user s home directory.

When used at the command-line prompt, the right angle bracket indicates that output should redirect into a file.

As you can see in Listing 5-12, the default configuration in /etc/sudoers is rather simple. Listing 5-12. Default Configuration in /etc/sudoers root@RNA:/etc# cat sudoers # /etc/sudoers # # This file MUST be edited with the 'visudo' command as root. # # See the man page for details on how to write a sudoers file. # Host alias specification # User alias specification

When used at the command-line prompt, the left angle bracket indicates that a command should accept input from a file (see redirect).

on Algebra)

When it appears at the command-line prompt, this symbol usually indicates that the user is currently logged in as root.

# User privilege specification root ALL=(ALL) ALL # Members of the admin group may gain root privileges %admin ALL=(ALL) ALL It s really just two lines of configuration The first line is root ALL=(ALL) ALL, which specifies that user root has the right to run all commands from all machines Next, you can see that the same is true for all users who belong to the user group admin Typically, this is only the user you have created during the installation of Ubuntu Server If, for example, you would like to specify that user linda is allowed to run the command /sbin/shutdown, no matter what host she is connecting from, add the following line: linda ALL=/sbin/shutdown This line consists of three parts In the first part, the username is entered.

When it appears at the command-line prompt, the dollar sign usually indicates that the user is currently logged in as an ordinary user. (Note that some versions of Linux/UNIX use % or > instead of $.)

Instead of the name of a specific user, you can refer to groups as well, but, if you do that, make sure to put a % sign before the group name The second part ALL in this example refers to the name of the host where the user is logged on Here, that host name has no limitations, but you can specify the name of a specific machine to minimize the risk of abuse by outsiders Next, the command that this user is allowed to use (/sbin/shutdown, no options) is specified This means that the user is allowed to run all options that can be used with this command If you want to allow the user just one option, you need to include that option in the command line If that s the case, all options that do not match the pattern you have specified in sudoers are specifically denied.

The question mark is a wildcard character indicating that any character can be substituted in its place; this symbol is typically relevant only at the command-line prompt.

SELECT t.teamname FROM Member m INNER JOIN Team t ON m.MemberID = t.Manager WHERE m.Team <> t.Teamname OR m.Team IS NULL

The asterisk is a wildcard character indicating that zero or more characters can appear in its place; this symbol is typically relevant only at the command-line prompt.

Now that the sudo configuration is in place, the specified user can run his commands To do this, the complete command should be referred to because the directories that typically house the root commands (/sbin, /usr/sbin) are not in the search path for normal users So, user linda should use the following command to shut down the machine: sudo /sbin/shutdown -h now.

Popular but unofficial way of describing the family tree that comprises UNIX and its various clones, such as Linux and Minix.

A user on the system with ultimate power to configure the system. Usually under standard Linux installations, this is another word for either the root user or one who has adopted that user s powers temporarily.