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Each person who wishes to log into Ubuntu must have a user account. This will define what that user can and cannot do on the system, with specific reference to files and folders. Because Ubuntu is effectively one large file system (even hardware devices are files; see 10), user permissions lie at the heart of controlling the entire system. They can limit which user has access to which hardware and software, and therefore control access to various PC functions. Each user also belongs to a group. Groups have the same style of permissions as individual users. File or folder access can be denied or granted to a user, depending on that person s group membership.

The following list is some of the most used options: async: Does not write to the file system synchronously but through the write cache mechanism This ensures that file writes are performed in the most efficient way, but you risk losing data if contact with the file system is suddenly lost dev: Treats block and character devices on the file system as devices and not as regular files For security reasons, it s a good idea to avoid using this option on devices that can be mounted by ordinary users exec: Permits execution of binary files hotplug: Do not report errors for this device if it does not currently exist This makes sense for hot-pluggable devices like USB media noatime: Do not update the access times on this file system every time a file is opened.

Note As in real life, a group can have many members and can be based around various interests. In a business environment, this might mean that groups are created for members of the accounting department and the human resources department. By changing the permissions on files created by the group members, each group can have files that only the group members can access (although, as always, anyone with superuser powers can access all files).

On a default Ubuntu system with just a handful of users, the group concept might seem somewhat redundant. However, the concept of groups is fundamental to the way Ubuntu works and cannot be avoided. Even if you don t use groups, Ubuntu still requires your user account to be part of one. In addition to actual human users, the Ubuntu system has its own set of user and group accounts. Various programs that access hardware resources or particular sets of files are part of these groups. Setting up system users and groups in this way makes the system more secure and easier to administer.

Have another look at the tables in Figure 4-1. How else might we have retrieved entries for Open tournaments We did this in the previous chapter using a join. We can join the two tables Entry and Tournament on their common fields TourID. Then select just those rows that are for Open tournaments and retrieve (or project) the MemberID column. The SQL statement is in Listing 4-6.

This option makes your file system somewhat faster if many reads are performed on it noauto: The file system will not be mounted automatically when the system boots or if a user uses the mount -a command to mount everything in /etc/fstab automatically mode: Used to set a permission mode (see 5) for new files that are created on the file system remount: Remounts a file system that is already mounted It only makes sense to use this option from the command line..

On most Linux systems, the root user has power over the entire system. Root can examine any file and configure any piece of hardware. Root typically belongs to its own unique group, also called root. Ubuntu is different from most Linux distributions in that the root account isn t used by default. Instead, certain users including the one set up during installation can borrow root-like, or superuser, powers by simply typing their login password. This is done by preceding commands with sudo or gksu at the command-line prompt, or as needed when using GUI programs that affect system settings. For some programs, including Users and Groups (System Administration Users and Groups), you need to click an Unlock button to gain superuser powers. Until you unlock the Users and Groups program, most of the buttons are grayed out and unusable. If you wish, you can activate the root user account on your system for administration purposes. To activate the root account, use the following command in a terminal window (see Appendix A for details on issuing commands in a terminal window): Sudo passwd root