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Tip You can view the octal notation by adding the column in Nautilus. Select View Visible Columns, and check the box next to Octal Permissions.

PhoneList now becomes a virtual table, and we can use it like one of our real tables in other queries. We just need to remember that the virtual table is created on the fly by running the query on the permanent Member table and is then gone. To get our phone list now, we can use the SQL statement in Listing 2-14.

Listing 4-7. The dumpe2fs Command Displays Properties of the Ext2 File System. root@ubuntu:~# dumpe2fs /dev/sad1 dumpe2fs 1.40-WIP (14-Nov-2006) dumpe2fs: No such file or directory while trying to open /dev/sad1 Couldn't find valid filesystem superblock. root@ubuntu:~# dumpe2fs /dev/sda1 dumpe2fs 1.40-WIP (14-Nov-2006) Filesystem volume name: <none> Last mounted on: <not available> Filesystem UUID: 62ec320f-491f-44cb-a395-1c0ee5c4afb2 Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_journal resize_inode dir_index filetype needs_recovery sparse_super Filesystem flags: signed directory hash Default mount options: (none) Filesystem state: clean Errors behavior: Continue Filesystem OS type: Linux Inode count: 62248 Block count: 248976 Reserved block count: 12448 Free blocks: 224527 Free inodes: 62218 First block: 1 Block size: 1024 Fragment size: 1024 Reserved GDT blocks: 256 Blocks per group: 8192 Fragments per group: 8192 Inodes per group: 2008 Inode blocks per group: 251 Filesystem created: Mon Jun 4 22:56:35 2007 Last mount time: Mon Jul 2 03:22:21 2007 Last write time: Mon Jul 2 03:22:21 2007 Mount count: 3 Maximum mount count: 26 Last checked: Mon Jun 4 22:56:35 2007 Check interval: 15552000 (6 months) Next check after: Sat Dec 1 21:56:35 2007 Reserved blocks uid: 0 (user root) Reserved blocks gid: 0 (group root) First inode: 11 Inode size: 128 Journal inode: 8 Default directory hash: tea

We touched on the idea of file system shortcuts in 9, when we discussed creating launchers on the GNOME desktop The problem with launchers is that they are recognized only within GNOME In other words, they mean nothing when you re using the command prompt (or virtually any other program that loads/saves files, with the exception of some programs created specially for the GNOME desktop environment) The Ubuntu file system offers two types of genuine shortcuts, which it refers to as file links They are symbolic links and hard links Symbolic links are the most commonly used A symbolic link is similar to a Windows shortcut in that a small file is created that points toward another file Unlike a Windows shortcut, however, the symbolic link isn t a real file it exists at the file system level, so it can t be viewed in a text editor, for example.

You can spot a symbolic link in a file listing in Nautilus because it has a small arrow pointing upward and to the right, and if you are in List view, the Type column indicates that it is a link to a file If you right-click the link and open its Properties window, you can see on the Basic tab the field link target to find out which is the original file A hard link is more complex and requires some understanding of how files work In simple terms, all files consist of a pointer and actual data As you might expect, the pointer tells the file system where on the disk to find the data Creating a hard link effectively creates an additional pointer to the data that has exactly the same attributes as the original pointer, except with a different name.

Directory Hash Seed: Journal backup: Journal size:

Performing any operation on the linked file will perform that operation on the original file Additionally, there will be no obvious sign that the hard link isn t a genuine file, apart from the fact that the link count a property of files will be greater than 1 This indicates that more than one file links to the data Maybe now you can see why people prefer to use the more obviously detectable symbolic links! To create a symbolic link, just right-click a file and select the option Make Link You can move the link wherever you want; it will still point to the correct file The new link has odd file permissions It claims to have Read/Write/Execute permissions for everybody (rwxrwxrwx), but actually, because it s a link, it mirrors the permissions of the file it links to.