generate 2d barcode c# UNDERSTANDING LINUX FILES AND USERS in Font

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CHAPTER 14 UNDERSTANDING LINUX FILES AND USERS
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total 112 drwxr-xr-x 2 drwxr-xr-x 3 lrwxrwxrwx 1 drwxr-xr-x 2 drwxr-xr-x 12 drwxr-xr-x 100 drwxr-xr-x 3 drwxr-xr-x 2 lrwxrwxrwx 1 g-2.6.12-9-386 drwxr-xr-x 19 drwxr-xr-x 2 drwxr-xr-x 5 drwxr-xr-x 2 drwxr-xr-x 2 dr-xr-xr-x 115 drwxr-xr-x 8 drwxr-xr-x 2 drwxr-xr-x 2 drwxr-xr-x 10 drwxrwxrwt 9 drwxr-xr-x 13 drwxr-xr-x 14 lrwxrwxrwx 1 12-9-386
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4096 2005-10-14 22:29 4096 2005-10-14 18:25 11 2005-10-14 18:01 4096 2005-10-14 18:09 0 2005-10-16 12:25 4096 2005-10-16 12:25 4096 2005-10-14 18:20 4096 2005-10-14 18:02 28 2005-10-14 18:08 4096 2005-10-14 22:30 49152 2005-10-14 18:00 4096 2005-10-14 18:01 4096 2005-10-05 05:37 4096 2005-10-14 18:02 0 2005-10-16 08:24 4096 2005-10-16 03:47 4096 2005-10-14 22:29 4096 2005-10-14 18:02 0 2005-10-16 08:24 4096 2005-10-16 17:27 4096 2005-10-14 22:29 4096 2005-10-14 22:47 25 2005-10-14 18:08
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bin boot cdrom -> media/cdrom debootstrap dev etc home initrd initrd.img -> boot/initrd.im lib lost+found media mnt opt proc root sbin srv sys tmp usr var vmlinuz -> boot/vmlinuz-2.6.
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The first thing you ll notice from this is that the root of the file system contains largely directories and that all files and directories are owned by root. Only users with administrative powers can write files to the root of the file system. That means if you wanted to write to the root of the file system or otherwise access those files, you would need to use the sudo command. This is to prevent damage, since most of the directories in the root of the file system are vital to the correct running of Linux and contain essential programs or data.
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Caution It s incredibly easy to slip up when using the command-line shell and thereby cause a lot of
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damage. For example, simply mistyping a forward slash in a command can mean the difference between deleting the files in a directory and deleting the directory itself. This is just another reason why you should always be careful when working at the command line, especially if you use the sudo command.
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As you can see from the file permissions of each directory in the root of the file system, most directories allow all users to browse them and access the files within (the last three characters of the permissions read r-x). You just won t be able to create new files there or delete the
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CHAPTER 14 UNDERSTANDING LINUX FILES AND USERS
directories themselves. You might be able to modify or execute programs contained within the directory, but this will depend on the permissions of each individual file. Table 14-3 provides a brief description of what each directory and file in the Ubuntu root file system contains. This is for reference only; there s no need for you to learn this information. The Ubuntu file system broadly follows the principles in the Filesystem Hierarchy Standard, as do most versions of Linux, but it does have its own subtleties.
Note The -> symbol in Table 14-3 indicates a symbolic link, which is similar to what Windows refers to
as a shortcut.
Table 14-3. Directories and Files in the Ubuntu Root File System
Directory
bin boot cdrom -> media/cdrom
Contents
Vital tools necessary to get the system running or for use when repairing the system and diagnosing problems Boot loader programs and configuration files (the boot loader is the menu that appears when you first boot Linux) Symbolic link (shortcut) to the entry for the CD or DVDROM drive in the /dev folder (accessing this file will let you access the CD-ROM drive) Contains files generated during the installation of Ubuntu Virtual files representing hardware installed on your system Central repository of configuration files for your system Where each user s personal directory is stored Symbolic link to the initial ramdisk, which is used to boot Linux Shared system files used by Linux as well as the software that runs on it Folder where salvaged scraps of files are saved in the event of a problematic shutdown and subsequent file system check Where the directories representing various mounted storage systems are made available (including Windows partitions on the disk) Directory in which external file systems can be temporarily mounted Software that is theoretically optional and not vital to the running of the system (many software packages you use daily can be found here) Virtual directory containing data about your system and its current status The root user s personal directory Programs essential to administration of the system
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