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This chapter introduced the command-line shell, considered by many to be the heart of Linux. We ve discussed its similarities to MS-DOS, and shown that these are only cursory; knowledge of DOS doesn t equate to skill within BASH. In the long run, you should work to polish your BASH skills. This chapter also introduced some elementary commands used within BASH, such as those used to provide directory listings and to copy files. We looked at how you can use command-line options to control BASH tools. In many cases, these are mandatory, so you learned how the BASH shell itself can be used to investigate a command and find out vital information about how it works. At this point, your newfound knowledge will have no doubt caused you to venture into the Ubuntu file system itself, which can be a confusing, if not terrifying, place for the inexperienced. But don t worry. The next chapter explains everything you need to know about the file system and what you ll find in it.
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Understanding Linux Files and Users
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ost of us are used to dealing with files the things that live on our hard disks, floppies, and DVD-ROMs, and contain data and program code. It should come as no surprise that Linux has its own file structure, which is different from Windows, in terms of where data is stored and also the underlying technology. Taking a page from Unix, Ubuntu takes the concept of the file system to an extreme. To Ubuntu, almost everything is treated as a file: your PC s hardware, network computers connected to your PC, information about the current state of your computer almost everything finds a home within the Linux file system. Linux places an equal emphasis on the users of the system. They own the various files and can decide who can and cannot access various files that they create or that are transferred to their ownership. In this chapter, we ll delve into users, files, and permissions. You ll be introduced to how Ubuntu handles files and how files are tied into the system of user accounts.
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Linux sees virtually everything as a series of files. This might sound absurd and certainly requires further explanation. Let s start with the example of plugging in a piece of hardware. Whenever you attach something to a USB socket, the Linux kernel finds it, sees if it can make the hardware work, and if everything checks out okay, it will usually make the hardware available as a file under the /dev directory on your hard disk (dev is short for devices). Figure 14-1 shows an example of a /dev directory. The file created in the /dev directory is not a real file, of course. It s a file system shortcut plumbed through to the input and output components of the hardware you ve just attached.
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CHAPTER 14 UNDERS TA NDIN G LINUX FILES AN D US ERS
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Note As a user, you re not expected to delve into the /dev directory and deal with this hardware directly.
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Most of the time, you ll use various software packages that will access the hardware for you or use special BASH commands or GUI programs to make the hardware available in a more accessible way for day-to-day use.
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Figure 14-1. Hardware devices under Linux are accessed as if they were files and can be found in the /dev folder.
Here s another example. Say you re working in an office, and you want to connect to a central file server. To do this under Linux, you must mount the files that the server offers, making it a part of the Ubuntu file system. Doing this involves creating an empty directory (or using one that already exists) and using the mount command at the BASH shell to make the server s contents magically appear whenever that directory is accessed. We ll discuss how this is done later in this chapter, in the Mounting section.
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