Introduction to vi editor
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vi is a simple text editor included in Red Hat Linux that can be used from the shell prompt. It opens files in Normal mode where you can view and run commands but not edit, and Insert mode where you can make edits. Common vi commands include h/j/k/l to move the cursor, i to insert text, dd to delete lines, :wq to save and exit, and :q! to exit without saving. The advantages of vi are that it has minimal system resource usage and works over slow connections.
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![Various Modes
By default, vi opens a file in Normal mode, meaning that
you can view and run built-in commands on the file but
you cannot add text to it. To add text, press [i] (for Insert
mode), which will allow you to make any modifications
you need to. To exit insert mode, press [Esc], and vi
reverts to Normal mode.
To exit vi, press [:] (which is the vi command mode) and
press [q] then [Enter]. If you have made changes to the
text file that you want to save, press [:] and type [w] then
[q] to write your changes to the file and exit the application.
If you accidentally made changes to a file and you want to
exit vi without saving the changes, type [:] and then type
[q] followed by [!], which exits without saving changes.](https://image.slidesharecdn.com/introductiontovieditor-120517064752-phpapp01/85/Introduction-to-vi-editor-5-320.jpg)
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Introduction to vi editor
- 1. Introduction to vi Editor Prepared By Santosh Sharma
- 2. Why vi editor? The advantage of learning vi and learning it well is that one will find vi on all Unix based systems and it does not consume an inordinate amount of system resources. Vi works great over slow network modem connections and on systems of limited resources. One can completely utilize vi without departing a single finger from the keyboard.
- 3. Shell Prompt Text Editors If you are not using a graphical desktop and want to read and modify a text or configuration file, Red Hat Linux includes the vi (pronounced vee-eye) text editor. vi is a simple application that opens within the shell prompt and allows you to view, search, and modify text files. To start vi, type vi at a shell prompt. To open a file with vi type vi <filename> at a shell prompt.
- 5. Various Modes By default, vi opens a file in Normal mode, meaning that you can view and run built-in commands on the file but you cannot add text to it. To add text, press [i] (for Insert mode), which will allow you to make any modifications you need to. To exit insert mode, press [Esc], and vi reverts to Normal mode. To exit vi, press [:] (which is the vi command mode) and press [q] then [Enter]. If you have made changes to the text file that you want to save, press [:] and type [w] then [q] to write your changes to the file and exit the application. If you accidentally made changes to a file and you want to exit vi without saving the changes, type [:] and then type [q] followed by [!], which exits without saving changes.
- 6. list of interactive commands Keystrokes Action h/j/k/l Move cursor left/down/up/right spacebar Move cursor right one space -/+ Move cursor down/up in first column ctrl-d Scroll down one half of a page ctrl-u Scroll up one half of a page ctrl-f Scroll forward one page ctrl-b Scroll back one page M (shift-h) Move cursor to middle of page H Move cursor to top of page
- 7. list of interactive commands L Move cursor to bottom of page W Move cursor a word at a time w Move cursor ahead 5 words 5w B Move cursor back a word at a time b Move cursor back a word at a time 5b Move cursor back 5 words e Move cursor to end of word 5e Move cursor ahead to the end of the 5th word 0 (zero) Move cursor to beginning of line $ Move cursor to end of line ) Move cursor to beginning of next sentence ( Move cursor to beginning of current sentence G Move cursor to end of file
- 8. list of interactive commands Keystr oke Action s i Insert at cursor a Append after cursor A Append at end of line ESC Terminate insert mode u Undo last change U Undo all changes to entire line o Open a new line dd Delete line 3dd Delete 3 lines.
- 9. list of interactive commands D Delete contents of line after cursor Delete contents of line after cursor and insert new text. Press C esc key to end insertion. dw Delete word 4dw Delete 4 words cw Change word x Delete character at cursor
- 10. Terminate session: Use command: ZZ Save changes and quit. Use command line: ":wq" Save (write) changes and quit. Use command line: ":w" Save (write) changes without quitting. Use command line: ":q!" Ignore changes and quit. No changes from last write will be saved. Use command line: ":qa" Quit all files opened.