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The Linux Shell and File Structure
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As with login, you can add your own shell commands to the logout file Using the Vi editor, you can change the farewell message or add other operations In the next example, the user has a clear and an echo command in the logout file When the user logs out, the clear command will clear the screen, and echo will display the message Good-bye for now logout
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clear echo "Good-bye for now"
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CHAPTER
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Linux Files, Directories, and Archives
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n Linux, all files are organized into directories that, in turn, are hierarchically connected to each other in one overall file structure A file is referenced not according to just its name, but also according to its place in this file structure You can create as many new directories as you want, adding more directories to the file structure The Linux file commands can perform sophisticated operations, such as moving or copying whole directories along with their subdirectories You can use file operations such as find, cp, mv, and ln to locate files and copy, move, or link them from one directory to another Desktop file managers, such as Konqueror and Nautilus used on the KDE and GNOME desktops, provide a graphical user interface to perform the same operations using icons, windows, and menus (see s 8 and 9) This chapter will focus on the commands you use in the shell command line to manage files, such as cp and mv However, whether you use the command line or a GUI file manager, the underlying file structure is the same The organization of the Linux file structure into its various system and network administration directories is discussed in detail in 32 Though not part of the Linux file structure, there are also special tools you can use to access Windows partitions and floppy disks These follow much the same format as Linux file commands Archives are used to back up files or to combine them into a package, which can then be transferred as one file over the Internet or posted on an FTP site for easy downloading The standard archive utility used on Linux and Unix systems is tar, for which several GUI front ends exist You have several compression programs to choose from, including GNU zip (gzip), Zip, bzip, and compress
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NOTE Linux also allows you to mount and access file systems used by other operating systems such
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as Unix or Windows Linux itself supports a variety of different file systems such as ext2, ext3, and ReiserFS
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Part II:
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The Linux Shell and File Structure
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Linux Files
You can name a file using any letters, underscores, and numbers You can also include periods and commas Except in certain special cases, you should never begin a filename with a period Other characters, such as slashes, question marks, or asterisks, are reserved for use as special characters by the system and should not be part of a filename Filenames can be as long as 256 characters Filenames can also include spaces, though to reference such filenames from the command line, be sure to encase them in quotes On a desktop like GNOME or KDE, you do not need quotes You can include an extension as part of a filename A period is used to distinguish the filename proper from the extension Extensions can be useful for categorizing your files You are probably familiar with certain standard extensions that have been adopted by convention For example, C source code files always have an extension of c Files that contain compiled object code have a o extension You can, of course, make up your own file extensions The following examples are all valid Linux filenames Keep in mind that to reference the last of these names on the command line, you would have to encase it in quotes as New book review :
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