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can be created to provide a list of all TTYs from which root can log in. By default, these only include local TTYs 1 through 6. On Ubuntu Server, this module is still used by default, which means that you can limit the TTYs where root can log in by manipulating this file.

-n: Specify number of lines to display (such as -n4) -c: Create new archive -j: Use bzip2 in order to compress (or decompress) files -f: Specifies filename (must be last in chain of command options) -r: Add files to existing archive -x: Extract files from existing archive -z: Use gzip to compress (or decompress) files

To find all teams like this, we would say: Find the team names from all the rows (t) in the Team table where the matching row (m) in the Member table for the team manager (i.e., t.Manager = m.MemberID) has a team (m.team) that is either empty or different from the team in the Team table (m.Team <> t.TeamName). The slightly more formal calculus notation representing this situation (and illustrated in Figure 6-9) is shown in Listing 6-7.

$ tar *

This very useful module can be used to keep track of attempts to access the system. It also allows the administrator to deny access if too many attempts fail. The PAM module pam_tally works with an application that uses the same name pam_tally that can be used to set the maximum amount of failed logins that are allowed. All attempts are logged by default in the /var/log/faillog file. If this module is called from a configuration file, be sure to at least use the options deny=n and lock_time. The first determines the maximum number of login attempts a user can make, and the second determines how long an account will be locked after that number of login attempts has been reached. The value given to lock_time is expressed in seconds by default.

Display piped output and also save it to specified file Program that both displays and lets the user manipulate processes

Based upon the configuration file /etc/security/time.conf, the pam_time module is used to limit the times between which users can log in to the system. You can use this module to limit the access for certain users to specific times of the day. Also, access can be further limited to services and specific TTYs that the user logs in from. The configuration file time.conf uses lines with the following form: services;ttys;users;times The next line is an example of a configuration line from time.conf that denies access to all users except root (the ! character in front of the times is used to deny access). This might be a perfect solution to prevent users from breaking into a system that they shouldn t be trying to log in to anyway. login ; tty* ; !root ; !Al0000-2400

$ top *

Listing 6-7. Calculus Expression to Find Teams Where the Manager Is Not a Member of the Team {t.TeamName | Team(t) and (m) Member(m) AND t.Manager = m.MemberID AND (m.Team IS NULL OR m.Team <> t.Team)}

Give specified file current time and date stamp; if it doesn t exist, create a zero-byte file with that name Discover and display network path to another host Set default permissions assigned to newly created files Unmount a file system Add new user

This is probably the most important of all modules: it is used to redirect authentication requests through the /etc/passwd and /etc/shadow files. The module can be used with several arguments, such as nullok and try_first_pass. The nullok argument allows a user with an empty password to connect to a service, and the try_first_pass argument will always try the password a user has already used (if a password is asked for again). Notice that many PAM configuration files include a line to call the common configuration file common-auth. The pam_unix file is called from here.

umount /media/cdrom -m: Create home directory for user -r: Remove user s /home directory useradd -m username userdel -r username

Delete all mention of user in system configuration files (effectively deleting the user, although files owned by the user might remain) Remove specified alias

The equivalent SQL is shown in Listing 6-8. The middle two lines are equivalent to a join between the two tables on m.MemberID = t.Manager.