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In this chapter, you learned how to use a variety of Linux text editors We first emphasized the important role text editors play in Linux system management tasks Unlike other operating systems that use a database to store system and application settings, Linux stores this information in a variety of text files To configure a Linux system, you need to know how to edit these files Normally we wouldn t spend much time learning how to use text editors However, because Linux text editors are a little harder to use than text editors on other operating systems, we spent a considerable amount of time learning how to operate them We pointed out that there are a variety of graphical front-ends now available to make system configuration tasks easier However, we pointed out that a good system administrator needs to understand the underlying configuration files being manipulated by these utilities To do that, you must know how to use a text editor We began by learning how to use text-based text editors The most commonly used editor (and the one you will be tested on in the Linux+ exam) is the vi editor Although vi is a relatively simple editor, it is small, it doesn t require a graphical environment, and it can fit on a floppy diskette This makes it ideal for use in emergency repair situations when you need to boot a malfunctioning system from a floppy To run vi, simply enter vi at a shell prompt To run vi and load a file, enter vi file name at a shell prompt If the file name you specify doesn t exist, vi will create a new file for you We then discussed the four different modes that vi can operate in In normal mode, you can t directly edit the text of the file To do this, you need to switch to insert mode or replace mode by pressing the key, the key, or the key To return to normal mode, you just press the key
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Once in insert mode or replace mode, you can edit the text file just as you would with most typical word processors The key difference is the fact that you can t use the key to erase text We then discussed the commands you can enter to perform file-related operations in command mode To enter command mode, you first switch to normal mode and then enter a full colon (:) This causes a command prompt to be displayed that you can use to enter vi commands, including the following:
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We then discussed the text manipulation commands that you can enter in normal mode These commands are entered without entering a colon (:) You can enter the following:
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We then shifted gears and looked at the Emacs editor Emacs is a more powerful text-based editor that many administrators prefer over vi It can use either keyboard commands or a menu-driven interface that can be manipulated with your mouse You will need to install the Emacs package on your Linux system before you can use the program To run Emacs, you simply enter emacs at a shell prompt Emacs saves files being worked on in memory buffers and uses the term buffers to refer to files being edited
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Writes the current file to disk Writes the current file and then closes vi Also writes the current file to disk and closes vi Closes vi without saving the current file Closes vi without saving the current file even if the file has been modified
Deletes the word that comes immediately after the cursor, including the space following the word Deletes the word that comes immediately after the cursor, but not the following space Deletes from the insertion point to the end of the line Deletes the entire current line Inserts deleted text after the current cursor location Undoes the last action Searches for the specified term in the file
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