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The data model in Figure 6-1 shows the two relationships between members and teams: members can belong to teams, and members can manage teams When we implement these relationships with foreign keys, the constraints that are placed on the data are quite simple A member can be in only a team that exists in the Team table, and a team can be managed only by someone in the Member table Other constraints are likely to apply in various situations For example, we might have the additional constraints that a team can have no more than four members and/or the manager must be a member of the team (or not) Referential integrity alone cannot address these rules Relational database products will usually provide some way to enforce such constraints Large systems such as SQL Server and Oracle provide triggers.

Secure Shell FTP; like FTP but running over an ssh connection (see ssh) Overwrite data in a file with gibberish, thereby making it irrecoverable -u: Delete file in addition to overwriting -v: Verbose; show details of procedure -f: Force permissions to allow writing if necessary

Pam_permit is by far the most insecure PAM service available. It does only one thing, and that s to grant access always no matter who tries to log in. All security mechanisms will be completely bypassed in this case, and even users who don t have a valid user account can use the services that are configured to use pam_permit. The only sensible use of pam_permit is to test the PAM awareness of a certain module or to disable account management completely and create a system that is wide open to everyone.

Pause input for the specified period of time (where s = seconds, m = minutes, h = hours, d = days) FTP-style program with which you can log in to an SMB-based (Windows) file share

$ smbclient *

Triggers are actions that take place at a specified time (for example, when inserting or updating a record) The trigger will check and reject any changes that do not obey the rules In Access and other products, it is not possible to apply such constraints to the tables themselves However, you can attach macros, which can do some sort of checking, to input forms We won t look in detail at how such constraints are implemented in various products, but we will look at how queries can help find any instances where the constraints are not satisfied Although this is finding the problem after it has occurred, variations of these queries would form a basis for any trigger or macro that you would need to write to enforce the constraints Let s look at finding teams whose managers are not members of the team.

This module lets user root access services without entering a password. It s used, for example, by the su utility to make sure the user root can su to any account, without having to enter a password for that user account.

smbclient //192.168.1.1/

Sort entries in the specified text file (default is ASCII sort) Log in to remote computer by using secure shell Start GUI session (if GUI isn t already running) Temporarily log in as specified user; log in as root if no user specified (provided root account is activated) Execute specified command with root privileges Display specified text file but in reverse (from last to first line) Display final lines of specified text file Combine specified files and/or directories into one larger file, or extract from such a file

In the old days when telnet connections were still very common, it was important for the user root never to use a telnet session for login because telnet sends passwords in clear text over the network. For this purpose, the securetty mechanism was created: a file /etc/securetty

$ ssh *

My mind often goes blank when faced with a query like this, and in that case, I always take a calculus approach This means picturing the tables involved and imagining the type of instance I am seeking Take a look at Figure 6-9 In Figure 6-9, TeamA s manager is 239, and we can see from the Member table that member 239 is not a member of any team If we had a constraint that managers must belong to the team, TeamA would not obey it..

ssh username@192.168.1.15