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This allows primitive cutting and pasting. Delete the text and then immediately undo, after which the text will remain in the buffer and can be pasted with Ctrl+Y.

If a directory has a default ACL, all files will get the permissions specified in that default ACL. Also, subdirectories will get the permissions from the default ACL, and these permissions will be set as their own permissions as well. If a default ACL exists for a directory, the umask setting is not used for that directory. To set a default ACL, the setfacl command must be used with the -d option. Otherwise, it can be used with parameters as seen earlier. The following example will apply a default ACL to somedir: setfacl -d -m group:account:rwx somedir Because this command uses the -d option, a default ACL is set for all entities that currently are listed as trustees of the directory. You can see in Listing 5-9 that the command getfacl is used to display the permissions currently applied to that directory. Listing 5-9. Displaying the Default ACL for a Directory myserver:~# getfacl somefile # file: somedir # owner: root # group: root user::rwx group::r-x other::r-x default:user::rwx default:group::r-x default:group:account:rwdefault:mask::rwx default:other::r-x The nice thing about working with default ACLs is that the rights that are granted in a default ACL are automatically added for all new files and directories created in that directory. However, you should be aware that, when you apply a default ACL to a directory, files and directories that currently exist within that directory are not touched by this default ACL. If you want to change permission settings in ACLs for existing files and directories, use the setfacl command with the option -R (recursive).

Let s look at the model in Figure 6-1, which shows how we might incorporate the idea of teams into our club database. The top line in Figure 6-1 can be interpreted, from left to right, as that a particular member might manage (at most) one team; and from right to left, as that each team has exactly one manager. The bottom relationship means, from left to right, that a particular member might play in (at most) one team; and from right to left, that a team has at least one member and could have many members playing for it.

In terms of the control over your system offered by keyboard commands, pressing Ctrl+Z has the effect of stopping the current program It suspends the program until you switch back into it or tell it to resume in another way, or manually kill it In the same style, pressing Ctrl+C while a program is running will quit it This sends the program s process a termination signal, a little like killing it by using the top program Ctrl+C can prove handy if you start a program running by accident and quickly want to end it, or if a command takes longer than you expected to work and you cannot wait for it to complete It s also a handy way of attempting to end crashed programs Some complicated programs don t take too kindly to being quit in this way, particularly those that need to save data before they terminate.

However, most should be okay Ctrl+D is another handy keyboard shortcut This sends the program an end-of-file (EOF) message In effect, this tells the program that you ve finished your input This can have a variety of effects, depending on the program you re running For example, pressing Ctrl+D on its own at the shell prompt when no program is running will cause you to log out (if you re using a GUI terminal emulator like GNOME Terminal, the program will quit) This happens because pressing Ctrl+D informs the BASH shell program that you ve finished your input BASH then interprets this as the cue that it should log you out.