Basic vi Commands
The UNIX vi editor is a full screen editor and has two modes of operation:
Command mode commands which cause action to be taken on the file, and
Insert mode in which entered text is inserted into the file.
In the command mode, every character typed is a command that does something to the text file
being edited; a character typed in the command mode may even cause the vi editor to enter the
In the insert mode, every character typed is added to the text in the file; pressing the <Esc> (Escape)
key turns off the Insert mode.
To Get Into and Out Of vi
To Start vi
To use vi on a file, type in vi filename. If the file named filename exists, then the first page (or
screen) of the file will be displayed; if the file does not exist, then an empty file and screen are
created into which you may enter text.
1. vi filename edit filename starting at line 1
2. vi -r filename recover filename that was being edited when system crashed
To Exit vi
Usually the new or modified file is saved when you leave vi. However, it is also possible to quit vi
without saving the file.
Note: The cursor moves to bottom of screen whenever a colon (:) is typed. This type of command is
completed by hitting the <Return> (or <Enter>) key.
1. :x<Return> quit vi, writing out modified file to file named in original invocation
2. :wq<Return> quit vi, writing out modified file to file named in original invocation
3. :q<Return>quit (or exit) vi
4. :q!<Return>quit vi even though latest changes have not been saved for this vi call
Moving the Cursor
Unlike many of the PC and MacIntosh editors, the mouse does not move the cursor within the vi
editor screen (or window).
You must use the the key commands listed below. On some UNIX platforms, the arrow keys may be
used as well; however, since vi was designed with the Qwerty keyboard (containing no arrow keys)
in mind, the arrow keys sometimes produce strange effects in vi and should be avoided.
If you go back and forth between a PC environment and a UNIX environment, you may find that this
dissimilarity in methods for cursor movement is the most frustrating difference between the two.
In the table below, the symbol ^ before a letter means that the <Ctrl> key should be held down
while the letter key is pressed.
1. j or <Return> [or down-arrow] move cursor down one line
2. k [or up-arrow] move cursor up one line
3. h or <Backspace> [or left-arrow] move cursor left one character
4. l or <Space> [or right-arrow] move cursor right one character
5. 0 (zero) move cursor to start of current line (the one with the cursor)
6. $ move cursor to end of current line
7. w move cursor to beginning of next word
8. b move cursor back to beginning of preceding word
9. :0<Return> or 1G move cursor to first line in file
10. :n<Return> or nG move cursor to line n
11. :$<Return> or G move cursor to last line in file
The following commands allow the vi editor screen (or window) to move up or down several lines
and to be refreshed.
1. ^f move forward one screen
2. ^b move backward one screen
3. ^d move down (forward) one half screen
4. ^u move up (back) one half screen
5. ^l redraws the screen
6. ^r redraws the screen, removing deleted lines
Adding, Changing, and Deleting Text
Unlike PC editors, you cannot replace or delete text by highlighting it with the mouse. Instead use
the commands in the following tables.
Perhaps the most important command is the one that allows you to back up and undo your last
action. Unfortunately, this command acts like a toggle, undoing and redoing your most recent
action. You cannot go back more than one step.
1. u UNDO WHATEVER YOU JUST DID; a simple toggle
The main purpose of an editor is to create, add, or modify text for a file.
Inserting or Adding Text
The following commands allow you to insert and add text. Each of these commands puts the vi
editor into insert mode; thus, the <Esc> key must be pressed to terminate the entry of text and to
put the vi editor back into command mode.
1. i insert text before cursor, until <Esc> hit
I insert text at beginning of current line, until <Esc> hit
2. a append text after cursor, until <Esc> hit
A append text to end of current line, until <Esc> hit
3. o open and put text in a new line below current line, until <Esc> hit
O open and put text in a new line above current line, until <Esc> hit
The following commands allow you to modify text.
1. r replace single character under cursor (no <Esc> needed)
R replace characters, starting with current cursor position, until <Esc> hit
2. cw change the current word with new text, starting with the character under cursor,
until <Esc> hit
3. cNw change N words beginning with character under cursor, until <Esc> hit;
e.g., c5w changes 5 words
4. C change (replace) the characters in the current line, until <Esc> hit
cc change (replace) the entire current line, stopping when <Esc> is hit
Ncc or cNc change (replace) the next N lines, starting with the current line, stopping
when <Esc> is hit
The following commands allow you to delete text.
1. x delete single character under cursor
Nx delete N characters, starting with character under cursor
dw delete the single word beginning with character under cursor
dNw delete N words beginning with character under cursor;
e.g., d5w deletes 5 words
1. D delete the remainder of the line, starting with current cursor position
dd delete entire current line
Ndd or dNd delete N lines, beginning with the current line;
e.g., 5dd deletes 5 lines
Cutting and Pasting Text
The following commands allow you to copy and paste text.
1. yy copy (yank, cut) the current line into the buffer
Nyy or yNy copy (yank, cut) the next N lines, including the current line, into the buffer
2. p put (paste) the line(s) in the buffer into the text after the current line
A common occurrence in text editing is to replace one word or phase by another. To locate instances
of particular sets of characters (or strings), use the following commands.
1. /string search forward for occurrence of string in text
2. ?string search backward for occurrence of string in text
3. n move to next occurrence of search string
N move to next occurrence of search string in opposite direction
Determining Line Numbers
Being able to determine the line number of the current line or the total number of lines in the file
being edited is sometimes useful.
1. :.= returns line number of current line at bottom of screen
2. := returns the total number of lines at bottom of screen
3. ^g provides the current line number, along with the total number of lines, in the file at
the bottom of the screen
Saving and Reading Files
These commands permit you to input and output files other than the named file with which you are
1. :r filename<Return> read file named filename and insert after current line (the line with
2. :w<Return> write current contents to file named in original vi call
3. :w newfile<Return> write current contents to a new file named newfile
4. :12,35w smallfile<Return> write the contents of the lines numbered 12 through 35 to a
new file named smallfile
5. :w! prevfile<Return> write current contents over a pre-existing file named prevfile