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In the queries we looked at in the previous sections, we used very simple conditions or criteria for determining whether to include a row in the result of a query. We looked at the

So if you attempt to access a shortcut that links to a file you don t have permission to access, you ll see the appropriate error message..

Group 0: (Blocks 1-8192) Primary superblock at 1, Group descriptors at 2-2 Reserved GDT blocks at 3-258 Block bitmap at 259 (+258), Inode bitmap at 260 (+259) Inode table at 261-511 (+260) 993 free blocks, 1993 free inodes, 2 directories Free blocks: 4640-5632 Free inodes: 16-2008 Group 1: (Blocks 8193-16384) Backup superblock at 8193, Group descriptors at 8194-8194 Reserved GDT blocks at 8195-8450 Block bitmap at 8451 (+258), Inode bitmap at 8452 (+259) Inode table at 8453-8703 (+260) 7221 free blocks, 2008 free inodes, 0 directories Free blocks: 9164-16384 Free inodes: 2009-4016 debugfs: The debugfs utility allows you to open the Ext2 file system debugger, from which you can perform powerful tasks These tasks are performed using the special debugfs commands that can be started from the debugfs interactive shell One of them is the lsdel command, which lists files that were recently deleted from your file system.

Summary

In this chapter you got to know two important elements of the Ubuntu experience, largely derived from its UNIX and Linux predecessors: users and permissions. These are important concepts that lay the foundation of the security implemented in Ubuntu. Through users, people can have their own experiences, configurations, data, and permissions. An important characteristic is that every user account can have its own files and set permissions on them. What files a user can change determines in brief what that user can do with the system. We discussed the differences between root and standard users, and how to allow temporary access to root s privileges. We showed you the steps to create users and group accounts, and investigated the sometimes puzzling notation for file and folder permissions. Once you ve mastered the basics, you should be ready to set permissions on your own.

value in just one field, such as MemberType = 'Junior'. In the following section, we will look more closely at the different ways you can specify quite complicated conditions.

After finding the inodes of these recently deleted files, you can use the debugfs dump command (not to be confused with the generic Linux dump command), followed by the number of the inode For example, use dump <17468> /somefile to dump everything the inode refers to in the file /somefile that is created automatically However, be aware that this works only if you are acting very fast: when a file is removed on any Linux file system, the inode and blocks that were used by the file are flagged as available, and, the next time data is written to the volume, the inode and blocks can be overwritten You should also be aware of the primary disadvantage of the debugfs method: it doesn t know anything about file or directory names.

You ll soon find out that Ubuntu offers great performance and relatively few stability problems, especially as compared to some other operating systems. (For instance, Linux file systems generally don t need to be defragmented, unless you have NTFS or FAT32 partitions to take care of). But you can always make it even better. If you still run into any performance issues, or if you simply want to get the most out of your system, this chapter is for you. You don t have to apply the topics it discusses; by default Ubuntu already works great without applying any optimizations to it, so you can skip it if you re satisfied with how your system runs. More often than not, the chapter discusses hacks clever methods of making things work in a nonstandard fashion. But as your experience of Ubuntu might have already taught you, such hacks are the lifeblood of Linux. One of the strengths of Linux is the ability to delve under the hood and change absolutely any aspect of the way it works. So even if the topics in this chapter are not essential, we recommend that you read the chapter carefully and consider applying its tips.