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This option may sound good, but, on a server where a file system is sometimes rarely remounted, it can make more sense to use the -i option to set an interval defined as a time period For example, tune2fs -i 2m will force an e2fsck on your Ext2 file system every two months The options to check the consistency of your Ext2 file system automatically are not the only options you can use with tune2fs For example, the option -l will list all information from the file system s superblock Another interesting option is -L label, which allows you to set a volume label.

If you re installing Ubuntu on a computer that already contains Windows, it s a good idea to perform three additional steps before actually installing Ubuntu. These steps will ensure that Ubuntu will be able to resize the Windows partition successfully. If your computer doesn t contain Windows, or if you re installing Ubuntu onto a second hard disk, you can skip straight to stage 2. The following are the steps for preparing the Windows partition for resizing: 1. 2. 3. Scan the disk for errors. Defragment the hard disk. Ensure that Windows is shut down correctly.

It is possible to keep the result of a query in a new permanent table (sometimes called a snapshot), but we usually don t want to do that because it will become out of date if the underlying data changes What we usually want to do is save the instructions so that we can ask the same question another day Consider our phone list query Every so often after the membership of the club has been updated, we might want to see a new phone list Rather than having to write the query in Listing 2-7 each time, we can save the instructions in what is known as a view Listing 2-13 shows how we can create a view so we can see upto-date phone lists.

You can easily change permissions of files and directories within Nautilus. You must be the owner of a file to change its permissions (or you can be root, of course; remember to use Gksudo in the Run Applications dialog box to open Nautilus with root privileges). Just right-click a file and select Properties. Figure 21-5 shows the Permissions tab of a file. You can set permissions for the owner, group, or everybody else. The available permissions are None (no access), Read-Only, and Read and Write. The permissions are applied automatically when you select them; if you keep your Nautilus windows open and visible behind the file properties window, you will see this, as the permissions get updated almost instantly.

This can be very useful if device names on your system do change on a regular basis: by using volume names, you can use the name of the volume when mounting the file system in /etc/fstab instead of the name of the device where the file system was created The last interesting option is -m, which you can use to set a percentage of reserved blocks for your Ext2 file system By default, the last 5 percent of available disk space is always reserved for the user root to prevent users from filling up the file system by accident Use the e2fsck -m 2 command to decrease the amount of reserved disk space dumpe2fs: Every file system maintains a lot of administrative information, and Ext2 stores this in the file system superblock.

You can enable the Execute permission by checking the Allow executing file as program check box. It applies for the owner, group, and other users alike. The permissions on a folder are somewhat more complicated, as shown in Figure 21-6.

We have to give the view a name, which can be anything we want (PhoneList seems sensible), and then we supply the SQL statement (as in Listing 2-7) for retrieving the appropriate data..