1 Vi Description
takes up the entire screen to display the edited file, except for the bottom line of the screen. The bottom line of the screen is used to enter commands, and for error and informational messages. If no other information is being displayed, the default display can show the current cursor row and cursor column, an indication of whether the file has been modified, and the current mode of the editor. See the [ruler ,] [showdirty] and [showmode] options for more information. Empty lines do not have any special representation on the screen, but lines on the screen that would logically come after the end of the file are displayed as a single tilde character. To differentiate between empty lines and lines consisting of only whitespace characters, use the [list] option. Historically, implementations of have also displayed some lines as single asterisk characters. These were lines that were not correctly displayed, i.e. lines on the screen that did not correspond to lines in the file, or lines that did not fit on the current screen. never displays lines in this fashion. is a modeful editor, i.e. it has two modes, mode and mode. When first starts, it is in command mode. There are several commands that change into text input mode. The character is used to resolve the text input into the file, and exit back into command mode. In command mode, the cursor is always positioned on the last column of characters which take up more than one column on the screen. In text insert mode, the cursor is positioned on the first column of characters which take up more than one column on the screen. Generally, if the cursor line and cursor column are not on the screen, then the screen is scrolled (if the target cursor is close) or repainted (if the target cursor is far away) so that the cursor is on the screen. If the screen is scrolled, it is moved a minimal amount, and the cursor line will usually appear at the top or bottom of the screen. In the screen is repainted, the cursor line will appear in the center of the screen, unless the cursor is sufficiently close to the beginning or end of the file that this is not possible. If the [leftright] option is set, the screen may be scrolled or repainted in a horizontal direction as well as in a vertical one. A major difference between the historical presentation and is in the scrolling and screen oriented position commands, and In historical implementations of these commands acted on physical (as opposed to logical, or screen) lines. For lines that were sufficiently long in relation to the size of the screen, this meant that single line scroll commands might repaint the entire screen, scrolling or screen positioning command might not change the screen or move the cursor at all, and some lines simply could not be displayed, even though would edit the file that contained them. In these commands act on logical, i.e. screen lines. You are unlikely to notice any difference unless you are editing files with lines significantly longer than a screen width. keeps track of the currently cursor position. Each command description (for commands that can change the current cursor position), specifies if the cursor is set to a specific location in the line, or if it is moved to the The latter means that the cursor is moved to the cursor position that is vertically as close as possible to the current cursor position. If the current line is shorter than the cursor position would select, the cursor is positioned on the last character in the line. (If the line is empty, the cursor is positioned on the first column of the line.) If a command moves the cursor to the most attractive position, it does not alter the current cursor position, and a subsequent movement will again attempt to move the cursor to that position. Therefore, although a movement to a line shorter than the currently most attractive position will cause the cursor to move to the end of that line, a subsequent movement to a longer line will cause the cursor to move back to the most attractive position. In addition, the command makes the end of each line the most attractive cursor position rather than a specific column. Each command described below notes where the cursor ends up after it is executed. This position is described in terms of characters on the line, i.e. or, This is to avoid needing to continually refer to on what part of the character the cursor rests. The following words have special meaning for commands.

previous context
    The position of the cursor before the command which caused the last absolute movement was executed. Each command described in the next section that is considered an absolute movement is so noted. In addition, specifying address to an command is considered an absolute movement.

motion
    A second command can be used as an optional trailing argument to the and (depending on the [tildeop] option) commands. This command indicates the end of the region of text that's affected by the command. The motion command may be either the command character repeated (in which case it means the current line) or a cursor movement command. In the latter case, the region affected by the command is from the starting or stopping cursor position which comes first in the file, to immediately before the starting or stopping cursor position which comes later in the file. Commands that operate on lines instead of using beginning and ending cursor positions operate on all of the lines that are wholly or partially in the region. In addition, some other commands become line oriented depending on where in the text they are used. The command descriptions below note these special cases.

    The following commands may all be used as motion components for commands:

    <control-A> | <control-H> | <control-J> | <control-M>
    <control-N> | <control-P> | <space> | $
    % | '<character> | ( | )
    + | , | - | /
    0 | ; | ? | B
    E | F | G | H
    L | M | N | T
    W | [[ | ]] | ^
     | `<character> | b | e
    f | h | j | k
    l | n | t | w
    { | | | }

    The optional count prefix available for some of the commands that take motion commands, or the count prefix available for the commands that are used as motion components, may be included and is considered part of the motion argument. For example, the commands and are equivalent, and the region affected by the command is two words of text. In addition, if the optional count prefix is specified for both the command and its motion component, the effect is multiplicative and is considered part of the motion argument. For example, the commands and are equivalent, and the region affected by the command is four words of text.

count
    A positive number used as an optional argument to most commands, either to give a size or a position (for display or movement commands), or as a repeat count (for commands that modify text). The count argument is always optional and defaults to 1 unless otherwise noted in the command description.

    When a command synopsis shows both a and they may be presented in any order.

bigword
    A set of non-whitespace characters preceded and followed by whitespace characters or the beginning or end of the file or line.

    Groups of empty lines (or lines containing only whitespace characters) are treated as a single bigword.

word
    Generally, in languages where it is applicable, recognizes two kinds of words. First, a sequence of letters, digits and underscores, delimited at both ends by: characters other than letters, digits, or underscores; the beginning or end of a line; the beginning or end of the file. Second, a sequence of characters other than letters, digits, underscores, or whitespace characters, delimited at both ends by: a letter, digit, underscore, or whitespace character; the beginning or end of a line; the beginning or end of the file.

    Groups of empty lines (or lines containing only whitespace characters) are treated as a single word.

paragraph
    An area of text that begins with either the beginning of a file, an empty line, or a section boundary, and continues until either an empty line, section boundary, or the end of the file.

    Groups of empty lines (or lines containing only whitespace characters) are treated as a single paragraph.

    Additional paragraph boundaries can be defined using the [paragraph] option.

section
    An area of text that starts with the beginning of the file or a line whose first character is an open brace and continues until the next section or the end of the file.

    Additional section boundaries can be defined using the [sections] option.

sentence
    An area of text that begins with either the beginning of the file or the first nonblank character following the previous sentence, paragraph, or section boundary and continues until the end of the file or a or a period exclamation point or question mark character, followed by either an end-of-line or two whitespace characters. Any number of closing parentheses brackets or double-quote characters can appear between the period, exclamation point, or question mark and the whitespace characters or end-of-line.

    Groups of empty lines (or lines containing only whitespace characters) are treated as a single sentence.

1 Vi Commands
The following section describes the commands available in the command mode of the editor. In each entry below, the tag line is a usage synopsis for the command character. In addition, the final line and column the cursor rests upon, and any options which affect the command are noted.

[count] <control-A>
    Search forward times for the current word. The current word begins at the first non-whitespace character on or after the current cursor position, and extends up to the next non-word character or the end of the line. The search is literal, i.e. no characters in the word have any special meaning in terms of Regular Expressions. It is an error if no matching pattern is found between the starting position and the end of the file.

    The command is an absolute movement. The command may be used as the motion component of other commands, in which case any text copied into a buffer is character oriented.

  Set to the line where the word is found.
Set to the first character of the word. Affected by the [extended ,] [ignorecase] and [wrapscan] options.

[count] <control-B>
    Page backward screens. Two lines of overlap are maintained by displaying the window starting at line where is the value of the [window] option. (In the case of split screens, this size is corrected to the current screen size.) This is an error if the movement is past the beginning of the file.

    The command is an absolute movement.

  Set to the last line of text displayed on the screen.
Set to the first nonblank character of the line. None.

[count] <control-D>
    Scroll forward lines. If is not specified, scroll forward the number of lines specified by the last or command. If this is the first or command, scroll forward half the number of lines in the screen. (In the case of split screens, the default scrolling distance is corrected to half the current screen size.) This is an error if the movement is past the end of the file.

    The command is an absolute movement.

  Set to the current line plus the number of lines scrolled.
Set to the first nonblank character of the line. None.

[count] <control-E>
    Scroll forward lines, leaving the cursor on the current line and column, if possible. This is an error if the movement is past the end of the file.

  Unchanged unless the current line scrolls off the screen,
in which case it is set to the first line on the screen. Unchanged unless the current line scrolls off the screen, in which case it is set to the most attractive cursor position. None.

[count] <control-F>
    Page forward screens. Two lines of overlap are maintained by displaying the window starting at line where is the value of the [window] option. (In the case of split screens, this size is corrected to the current screen size.) This is an error if the movement is past the end of the file.

    The command is an absolute movement.

  Set to the first line on the screen.
Set to the first nonblank character of the current line. None.

<control-G>
    Display the file information. The information includes the current pathname, the current line, the number of total lines in the file, the current line as a percentage of the total lines in the file, if the file has been modified, was able to be locked, if the file's name has been changed, and if the edit session is read-only.

  Unchanged.
Unchanged. None.

<control-H>
    Move the cursor back characters in the current line. This is an error if the cursor is on the first character in the line.

    The and commands may be used as the motion component of other commands, in which case any text copied into a buffer is character oriented.

  Unchanged.
Set to the character, or, the first character in the line if is greater than or equal to the number of characters in the line before the cursor. None.

[count] <control-J>
    Move the cursor down lines without changing the current column. This is an error if the movement is past the end of the file.

    The and commands may be used as the motion component of other commands, in which case any text copied into a buffer is line oriented.

  Set to the current line plus
The most attractive cursor position. None.

<control-L>
    Repaint the screen.

  Unchanged.
Unchanged. None.

[count] <control-M>
    Move the cursor down lines to the first nonblank character of that line. This is an error if the movement is past the end of the file.

    The and commands may be used as the motion component of other commands, in which case any text copied into a buffer is line oriented.

  Set to the current line plus
Set to the first nonblank character in the line. None.

[count] <control-P>
    Move the cursor up lines, without changing the current column. This is an error if the movement is past the beginning of the file.

    The and commands may be used as the motion component of other commands, in which case any text copied into a buffer is line oriented.

  Set to the current line minus count.
The most attractive cursor position. None.

<control-T>
    Return to the most recent tag context. The command is an absolute movement.

  Set to the context of the previous tag command.
Set to the context of the previous tag command. None.

<control-U>
    Scroll backward lines. If is not specified, scroll backward the number of lines specified by the last or command. If this is the first or command, scroll backward half the number of lines in the screen. (In the case of split screens, the default scrolling distance is corrected to half the current screen size.) This is an error if the movement is past the beginning of the file.

    The command is an absolute movement.

  Set to the current line minus the amount scrolled.
Set to the first nonblank character in the line. None.

<control-W>
    Switch to the next lower screen in the window, or, to the first screen if there are no lower screens in the window.

  Set to the previous cursor position in the window.
Set to the previous cursor position in the window. None.

<control-Y>
    Scroll backward lines, leaving the current line and column as is, if possible. This is an error if the movement is past the beginning of the file.

  Unchanged unless the current line scrolls off the screen,
in which case it is set to the last line of text displayed on the screen. Unchanged unless the current line scrolls off the screen, in which case it is the most attractive cursor position. None.

<control-Z>
    Suspend the current editor session. If the file has been modified since it was last completely written, and the [autowrite] option is set, the file is written before the editor session is suspended. If this write fails, the editor session is not suspended.

  Unchanged.
Unchanged. Affected by the [autowrite] option.

<escape>
    Execute commands or cancel partial commands. If an command is being entered (e.g. or the command is executed. If a partial command has been entered, e.g. or the command is cancelled. Otherwise, it is an error.

  When an
command is being executed, the current line is set as described for that command. Otherwise, unchanged. When an command is being executed, the current column is set as described for that command. Otherwise, unchanged. None.

<control-]>
    Push a tag reference onto the tag stack. The tags files (see the [tags] option for more information) are searched for a tag matching the current word. The current word begins at the first non-whitespace character on or after the current cursor position, and extends up to the next non-word character or the end of the line. If a matching tag is found, the current file is discarded and the file containing the tag reference is edited.

    If the current file has been modified since it was last completely written, the command will fail. The command is an absolute movement.

  Set to the line containing the matching tag string.
Set to the start of the matching tag string. Affected by the [tags] and [taglength] options.

<control-^>
    Switch to the most recently edited file.

    If the file has been modified since it was last completely written, and the [autowrite] option is set, the file is written out. If this write fails, the command will fail. Otherwise, if the current file has been modified since it was last completely written, the command will fail.

  Set to the line the cursor was on when the file was last edited.
Set to the column the cursor was on when the file was last edited. Affected by the [autowrite] option.

[count] <space>
    Move the cursor forward characters without changing the current line. This is an error if the cursor is on the last character in the line.

    The and commands may be used as the motion component of other commands, in which case any text copied into a buffer is character oriented. In addition, these commands may be used as the motion components of other commands when the cursor is on the last character in the line, without error.

  Unchanged.
Set to the current character plus the next characters, or to the last character on the line if is greater than the number of characters in the line after the current character. None.

[count] ! motion shell-argument(s)
    Replace text with results from a shell command. Pass the lines specified by the and arguments as standard input to the program named by the [shell] option, and replace those lines with the output (both standard error and standard output) of that command.

    After the motion is entered, prompts for arguments to the shell command.

    Within those arguments, and characters are expanded to the current and alternate pathnames, respectively. The character is expanded with the command text of the previous or commands. (Therefore, the command repeats the previous command.) The special meanings of and can be overridden by escaping them with a backslash. If no or command has yet been executed, it is an error to use an unescaped character. The command does do shell expansion on the strings provided as arguments. If any of the above expansions change the arguments the user entered, the command is redisplayed at the bottom of the screen.

    then executes the program named by the [shell] option, with a flag followed by the arguments (which are bundled into a single argument).

    The command is permitted in an empty file.

    If the file has been modified since it was last completely written, the command will warn you.

  The first line of the replaced text.
The first column of the replaced text. Affected by the [shell] option.

[count] # +|-|#
    Increment or decrement the current number. The current number begins at the first non-number character on or before the current cursor position, or the beginning of the line, and extends up to the first non-number character on or after the current cursor position or the end of the line. If the trailing character is a the number is incremented by If the trailing character is a the number is decremented by If the trailing character is a the previous increment or decrement is repeated.

    The format of the number (decimal, hexadecimal, and octal, and leading 0's) is retained unless the new value cannot be represented in the previous format.

  Unchanged.
Set to the first character in the cursor word. None.

[count] $
    Move the cursor to the end of a line. If is specified, the cursor moves down lines.

    It is not an error to use the command when the cursor is on the last character in the line or when the line is empty.

    The command may be used as the motion component of other commands, in which case any text copied into a buffer is character oriented, unless the cursor is at, or before the first nonblank character in the line, in which case it is line oriented. It is not an error to use the command as a motion component when the cursor is on the last character in the line, although it is an error when the line is empty.

  Set to the current line plus
minus 1. Set to the last character in the line. None.

%   Move to the matching character. The cursor moves to the parenthesis or curly brace which the parenthesis or curly brace found at the current cursor position or which is the closest one to the right of the cursor on the line. It is an error to execute the command on a line without a parenthesis or curly brace. Historically, any specified to the command was ignored.

    The command is an absolute movement. The command may be used as the motion component of other commands, in which case any text copied into a buffer is character oriented, unless the starting point of the region is at or before the first nonblank character on its line, and the ending point is at or after the last nonblank character on its line, in which case it is line oriented.

  Set to the line containing the matching character.
Set to the matching character. None.

&   Repeat the previous substitution command on the current line.

    Historically, any specified to the command was ignored.

  Unchanged.
Unchanged if the cursor was on the last character in the line, otherwise, set to the first nonblank character in the line. Affected by the [edcompatible ,] [extended ,] [ignorecase] and [magic] options.

'<character>
    Return to a context marked by the character If is the or character, return to the previous context. If is any other character, return to the context marked by that character (see the command for more information). If the command is the command, only the line value is restored, and the cursor is placed on the first nonblank character of that line. If the command is the command, both the line and column values are restored.

    It is an error if the context no longer exists because of line deletion. (Contexts follow lines that are moved, or which are deleted and then restored.)

    The and commands are both absolute movements. They may be used as a motion component for other commands. For the command, any text copied into a buffer is line oriented. For the command, any text copied into a buffer is character oriented, unless it both starts and stops at the first character in the line, in which case it is line oriented. In addition, when using the command as a motion component, commands which move backward and started at the first character in the line, or move forward and ended at the first character in the line, are corrected to the last character of the starting and ending lines, respectively.

  Set to the line from the context.
Set to the first nonblank character in the line, for the command, and set to the context's column for the command. None.

[count] (
    Back up sentences.

    The command is an absolute movement. The command may be used as the motion component of other commands, in which case any text copied into a buffer is character oriented, unless the starting and stopping points of the region are the first character in the line, in which case it is line oriented. In the latter case, the stopping point of the region is adjusted to be the end of the line immediately before it, and not the original cursor position.

  Set to the line containing the beginning of the sentence.
Set to the first nonblank character of the sentence. None.

[count] )
    Move forward sentences.

    The command is an absolute movement. The command may be used as the motion component of other commands, in which case any text copied into a buffer is character oriented, unless the starting point of the region is the first character in the line, in which case it is line oriented. In the latter case, if the stopping point of the region is also the first character in the line, it is adjusted to be the end of the line immediately before it.

  Set to the line containing the beginning of the sentence.
Set to the first nonblank character of the sentence. None.

[count] ,
    Reverse find character times. Reverse the last or command, searching the other way in the line, times.

    The command may be used as the motion component of other commands, in which case any text copied into a buffer is character oriented.

  Unchanged.
Set to the searched-for character. None.

[count] -
    Move to first nonblank of the previous line, times.

    This is an error if the movement is past the beginning of the file.

    The command may be used as the motion component of other commands, in which case any text copied into a buffer is line oriented.

  Set to the current line minus
Set to the first nonblank character in the line. None.

[count] .
    Repeat the last command that modified text. The repeated command may be a command and motion component combination. If is specified, it replaces the count specified for the repeated command, and, if applicable, for the repeated motion component. If is not specified, the counts originally specified to the command being repeated are used again.

    As a special case, if the command is executed immediately after the command, the change log is rolled forward or backward, depending on the action of the command.

  Set as described for the repeated command.
Set as described for the repeated command. None.

/RE<carriage-return>
    Search forward or backward for a regular expression. The commands beginning with a slash character are forward searches, the commands beginning with a question mark are backward searches. prompts with the leading character on the last line of the screen for a string. It then searches forward or backward in the file for the next occurrence of the string, which is interpreted as a Basic Regular Expression.

    The and commands are absolute movements. They may be used as the motion components of other commands, in which case any text copied into a buffer is character oriented, unless the search started and ended on the first column of a line, in which case it is line oriented. In addition, forward searches ending at the first character of a line, and backward searches beginning at the first character in the line, are corrected to begin or end at the last character of the previous line. (Note, forward and backward searches can occur for both and commands, if the [wrapscan] option is set.)

    If an offset from the matched line is specified (i.e. a trailing or character is followed by a signed offset), the buffer will always be line oriented (e.g. will always guarantee a line orientation).

    The command repeats the previous search.

    The command repeats the previous search, but in the reverse direction.

    Missing RE's (e.g. or search for the last search RE, in the indicated direction.

    Searches may be interrupted using the character.

  Set to the line in which the match occurred.
Set to the first character of the matched string. Affected by the [edcompatible ,] [extended ,] [ignorecase ,] [magic ,] and [wrapscan] options.

0   Move to the first character in the current line. It is not an error to use the command when the cursor is on the first character in the line,

    The command may be used as the motion component of other commands, in which case it is an error if the cursor is on the first character in the line.

  Unchanged.
Set to the first character in the line. None.

:   Execute an ex command. prompts for an command on the last line of the screen, using a colon character. The command is terminated by a or character; all of these characters may be escaped by using a character. The command is then executed.

    If the command writes to the screen, will prompt the user for a before continuing when the command finishes. Large amounts of output from the command will be paged for the user, and the user prompted for a or key to continue. In some cases, a quit (normally a character) or may be entered to interrupt the command.

    When the command finishes, and the user is prompted to resume visual mode, it is also possible to enter another character followed by another command.

  The current line is set as described for the
command. The current column is set as described for the command. None.

[count] ;
    Repeat the last character find times. The last character find is one of the or commands.

    The command may be used as the motion component of other commands, in which case any text copied into a buffer is character oriented.

  Unchanged.
Set to the searched-for character. None.

[count] < motion
    Shift lines left or right. Shift the number of lines in the region specified by the motion component, times left (for the command) or right (for the command) by the number of columns specified by the [shiftwidth] option. Only whitespace characters are deleted when shifting left; once the first character in the line contains a nonblank character, the will succeed, but the line will not be modified.

  Unchanged.
Set to the first nonblank character in the line. Affected by the [shiftwidth] option.

@ buffer
    Execute a named buffer. Execute the named buffer as commands. The buffer may include commands, too, but they must be expressed as a command. If the buffer is line oriented, characters are logically appended to each line of the buffer. If the buffer is character oriented, characters are logically appended to all but the last line in the buffer.

    If the buffer name is or then the last buffer executed shall be used. It is an error to specify or if there were no buffer previous executions. The text of a macro may contain an command, and it is possible to create infinite loops in this manner. (The character may be used to interrupt the loop.)

  The current line is set as described for the command(s).
The current column is set as described for the command(s). None.

[count] A
    Enter input mode, appending the text after the end of the line. If is specified, the text is repeatedly input more times after input mode is exited.

  Set to the last line upon which characters were entered.
Set to the last character entered. Affected by the [altwerase ,] [autoindent ,] [beautify ,] [showmatch ,] [ttywerase] and [wrapmargin] options.

[count] B
    Move backward bigwords. Move the cursor backward to the beginning of a bigword by repeating the following algorithm: if the current position is at the beginning of a bigword or the character at the current position cannot be part of a bigword, move to the first character of the preceding bigword. Otherwise, move to the first character of the bigword at the current position. If no preceding bigword exists on the current line, move to the first character of the last bigword on the first preceding line that contains a bigword.

    The command may be used as the motion component of other commands, in which case any text copied into a buffer is character oriented.

  Set to the line containing the word selected.
Set to the first character of the word selected. None.

[buffer] [count] C
    Change text from the current position to the end-of-line. If is specified, the input text replaces from the current position to the end-of-line, plus subsequent lines.

  Set to the last line upon which characters were entered.
Set to the last character entered. Affected by the [altwerase ,] [autoindent ,] [beautify ,] [showmatch ,] [ttywerase] and [wrapmargin] options.

[buffer] D
    Delete text from the current position to the end-of-line.

    It is not an error to execute the command on an empty line.

  Unchanged.
Set to the character before the current character, or, column 1 if the cursor was on column 1. None.

[count] E
    Move forward end-of-bigwords. Move the cursor forward to the end of a bigword by repeating the following algorithm: if the current position is the end of a bigword or the character at that position cannot be part of a bigword, move to the last character of the following bigword. Otherwise, move to the last character of the bigword at the current position. If no succeeding bigword exists on the current line, move to the last character of the first bigword on the next following line that contains a bigword.

    The command may be used as the motion component of other commands, in which case any text copied into a buffer is character oriented.

  Set to the line containing the word selected.
Set to the last character of the word selected. None.

[count] F <character>
    Search times backward through the current line for

    The command may be used as the motion component of other commands, in which case any text copied into a buffer is character oriented.

  Unchanged.
Set to the searched-for character. None.

[count] G
    Move to line or the last line of the file if not specified.

    The command is an absolute movement. The command may be used as the motion component of other commands, in which case any text copied into a buffer is line oriented.

  Set to
if specified, otherwise, the last line. Set to the first nonblank character in the line. None.

[count] H
    Move to the screen line lines below the top of the screen.

    The command is an absolute movement. The command may be used as the motion component of other commands, in which case any text copied into a buffer is line oriented.

  Set to the line
lines below the top of the screen. Set to the first nonblank character of the line. None.

[count] I
    Enter input mode, inserting the text at the beginning of the line. If is specified, the text input is repeatedly input more times.

  Set to the last line upon which characters were entered.
Set to the last character entered. None.

[count] J
    Join lines. If is specified, lines are joined; a minimum of two lines are always joined, regardless of the value of

    If the current line ends with a whitespace character, all whitespace is stripped from the next line. Otherwise, if the next line starts with a open parenthesis do nothing. Otherwise, if the current line ends with a question mark period or exclamation point insert two spaces. Otherwise, insert a single space.

    It is not an error to join lines past the end of the file, i.e. lines that do not exist.

  Unchanged.
Set to the character after the last character of the next-to-last joined line. None.

[count] L
    Move to the screen line lines above the bottom of the screen.

    The command is an absolute movement. The command may be used as the motion component of other commands, in which case any text copied into a buffer is line oriented.

  Set to the line
lines above the bottom of the screen. Set to the first nonblank character of the line. None.

M   Move to the screen line in the middle of the screen.

    The command is an absolute movement. The command may be used as the motion component of other commands, in which case any text copied into a buffer is line oriented.

    Historically, any specified to the command was ignored.

  Set to the line in the middle of the screen.
Set to the first nonblank character of the line. None.

[count] O
    Enter input mode, appending text in a new line above the current line. If is specified, the text input is repeatedly input more times.

    Historically, any specified to the command was ignored.

  Set to the last line upon which characters were entered.
Set to the last character entered. Affected by the [altwerase ,] [autoindent ,] [beautify ,] [showmatch ,] [ttywerase] and [wrapmargin] options.

[buffer] P
    Insert text from a buffer. Text from the buffer (the unnamed buffer by default) is inserted before the current column or, if the buffer is line oriented, before the current line.

  Set to the lowest numbered line insert,
if the buffer is line oriented, otherwise unchanged. Set to the first nonblank character of the appended text, if the buffer is line oriented, otherwise, the last character of the appended text. None.

Q   Exit (or visual) mode and switch to mode.

  Unchanged.
No longer relevant. None.

[count] R
    Enter input mode, replacing the characters in the current line. If is specified, the text input is repeatedly input more times.

    If the end of the current line is reached, no more characters are replaced and any further characters input are appended to the line.

  Set to the last line upon which characters were entered.
Set to the last character entered. Affected by the [altwerase ,] [autoindent ,] [beautify ,] [showmatch ,] [ttywerase] and [wrapmargin] options.

[buffer] [count] S
    Substitute lines.

  Set to the last line upon which characters were entered.
Set to the last character entered. Affected by the [altwerase ,] [autoindent ,] [beautify ,] [showmatch ,] [ttywerase] and [wrapmargin] options.

[count] T <character>
    Search backward, times, through the current line for the character the specified

    The command may be used as the motion component of other commands, in which case any text copied into a buffer is character oriented.

  Unchanged.
Set to the character the searched-for character. None.

U   Restore the current line to its state before the cursor last moved to it.

  Unchanged.
The first character in the line. None.

[count] W
    Move forward bigwords. Move the cursor forward to the beginning of a bigword by repeating the following algorithm: if the current position is within a bigword or the character at that position cannot be part of a bigword, move to the first character of the next bigword. If no subsequent bigword exists on the current line, move to the first character of the first bigword on the first following line that contains a bigword.

    The command may be used as the motion component of other commands, in which case any text copied into a buffer is character oriented.

  The line containing the word selected.
The first character of the word selected. None.

[buffer] [count] X
    Delete characters before the cursor. If the number of characters to be deleted is greater than or equal to the number of characters to the beginning of the line, all of the characters before the current cursor position, to the beginning of the line, are deleted.

  Unchanged.
Set to the current character minus or the first character if count is greater than the number of characters in the line before the cursor. None.

[buffer] [count] Y
    Copy (or lines into the specified buffer.

  Unchanged.
Unchanged. None.

ZZ  Write the file and exit The file is only written if it has been modified since the last complete write of the file to any file.

    The command will exit the editor after writing the file, if there are no further files to edit. Entering two commands (i.e. or in a row will override this check and the editor will exit, ignoring any files that have not yet been edited.

  Unchanged.
Unchanged. None.

[count] [[
    Back up section boundaries.

    The command is an absolute movement. The command may be used as the motion component of other commands, in which case any text copied into a buffer is character oriented, unless the starting position is column 0, in which case it is line oriented.

    This is an error if the movement is past the beginning of the file.

  Set to the previous line that is
section boundaries back, or the first line of the file if no more section boundaries exist preceding the current line. Set to the first nonblank character in the line. Affected by the [sections] option.

[count] ]]
    Move forward section boundaries.

    The command is an absolute movement. The command may be used as the motion component of other commands, in which case any text copied into a buffer is character oriented, unless the starting position is column 0, in which case it is line oriented.

    This is an error if the movement is past the end of the file.

  Set to the line that is
section boundaries forward, or to the last line of the file if no more section boundaries exist following the current line. Set to the first nonblank character in the line. Affected by the [sections] option.

^   Move to first nonblank character on the current line.

    The command may be used as the motion component of other commands, in which case any text copied into a buffer is character oriented.

  Unchanged.
Set to the first nonblank character of the current line. None.

[count] _
    Move down lines, to the first nonblank character. The command may be used as the motion component of other commands, in which case any text copied into a buffer is line oriented.

    It is not an error to execute the command when the cursor is on the first character in the line.

  The current line plus
The first nonblank character in the line. None.

[count] a
    Enter input mode, appending the text after the cursor. If is specified, the text input is repeatedly input more times.

  Set to the last line upon which characters were entered.
Set to the last character entered. Affected by the [altwerase ,] [autoindent ,] [beautify ,] [showmatch ,] [ttywerase] and [wrapmargin] options.

[count] b
    Move backward words. Move the cursor backward to the beginning of a word by repeating the following algorithm: if the current position is at the beginning of a word, move to the first character of the preceding word. Otherwise, the current position moves to the first character of the word at the current position. If no preceding word exists on the current line, move to the first character of the last word on the first preceding line that contains a word.

    The command may be used as the motion component of other commands, in which case any text copied into a buffer is character oriented.

  Set to the line containing the word selected.
Set to the first character of the word selected. None.

[buffer] [count] c motion
    Change a region of text. If only part of a single line is affected, then the last character being changed is marked with a Otherwise, the region of text is deleted, and input mode is entered.

    If is specified, it is applied to the

  Set to the last line upon which characters were entered.
Set to the last character entered. Affected by the [altwerase ,] [autoindent ,] [beautify ,] [showmatch ,] [ttywerase] and [wrapmargin] options.

[buffer] [count] d motion
    Delete a region of text. If is specified, it is applied to the

  Set to the line where the region starts.
Set to the first character in the line after the last character in the region. If no such character exists, set to the last character before the region. None.

[count] e
    Move forward end-of-words. Move the cursor forward to the end of a word by repeating the following algorithm: if the current position is the end of a word, move to the last character of the following word. Otherwise, move to the last character of the word at the current position. If no succeeding word exists on the current line, move to the last character of the first word on the next following line that contains a word.

    The command may be used as the motion component of other commands, in which case any text copied into a buffer is character oriented.

  Set to the line containing the word selected.
Set to the last character of the word selected. None.

[count] f <character>
    Search forward, times, through the rest of the current line for

    The command may be used as the motion component of other commands, in which case any text copied into a buffer is character oriented.

  Unchanged.
Set to the searched-for character. None.

[count] i
    Enter input mode, inserting the text before the cursor. If is specified, the text input is repeatedly input more times.

  Set to the last line upon which characters were entered.
Set to the last character entered. Affected by the [altwerase ,] [autoindent ,] [beautify ,] [showmatch ,] [ttywerase] and [wrapmargin] options.

m <character>
    Save the current context (line and column) as The exact position is referred to by The line is referred to by

    Historically, was restricted to lower-case letters only, permits the use of any character.

  Unchanged.
Unchanged. None.

[count] o
    Enter input mode, appending text in a new line under the current line. If is specified, the text input is repeatedly input more times.

    Historically, any specified to the command was ignored.

  Set to the last line upon which characters were entered.
Set to the last character entered. Affected by the [altwerase ,] [autoindent ,] [beautify ,] [showmatch ,] [ttywerase] and [wrapmargin] options.

[buffer] p
    Append text from a buffer. Text from the buffer (the unnamed buffer by default) is appended after the current column or, if the buffer is line oriented, after the current line.

  Set to the first line appended, if the buffer is line oriented,
otherwise unchanged. Set to the first nonblank character of the appended text if the buffer is line oriented, otherwise, the last character of the appended text. None.

[count] r <character>
    Replace characters. The next characters in the line are replaced with Replacing characters with characters results in creating new, empty lines into the file.

    If is the command is cancelled.

  Unchanged unless the replacement character is a
in which case it is set to the current line plus Set to the last character replaced, unless the replacement character is a in which case the cursor is in column 1 of the last line inserted. None.

[buffer] [count] s
    Substitute characters in the current line starting with the current character.

  Set to the last line upon which characters were entered.
Set to the last character entered. Affected by the [altwerase ,] [autoindent ,] [beautify ,] [showmatch ,] [ttywerase] and [wrapmargin] options.

[count] t <character>
    Search forward, times, through the current line for the character immediately

    The command may be used as the motion component of other commands, in which case any text copied into a buffer is character oriented.

  Unchanged.
Set to the character the searched-for character. None.

u   Undo the last change made to the file. If repeated, the command alternates between these two states, and is its own inverse. When used after an insert that inserted text on more than one line, the lines are saved in the numeric buffers.

    The command, when used immediately after the command, causes the change log to be rolled forward or backward, depending on the action of the command.

  Set to the position of the first line changed, if the reversal affects
only one line or represents an addition or change; otherwise, the line preceding the deleted text. Set to the cursor position before the change was made. None.

[count] w
    Move forward words. Move the cursor forward to the beginning of a word by repeating the following algorithm: if the current position is at the beginning of a word, move to the first character of the next word. If no subsequent word exists on the current line, move to the first character of the first word on the first following line that contains a word.

    The command may be used as the motion component of other commands, in which case any text copied into a buffer is character oriented.

  Set to the line containing the word selected.
Set to the first character of the word selected. None.

[buffer] [count] x
    Delete characters. The deletion is at the current character position. If the number of characters to be deleted is greater than or equal to the number of characters to the end of the line, all of the characters from the current cursor position to the end of the line are deleted.

  Unchanged.
Unchanged unless the last character in the line is deleted and the cursor is not already on the first character in the line, in which case it is set to the previous character. None.

[buffer] [count] y motion
    Copy (or a text region specified by the and motion into a buffer. If is specified, it is applied to the

  Unchanged, unless the region covers more than a single line,
in which case it is set to the line where the region starts. Unchanged, unless the region covers more than a single line, in which case it is set to the character were the region starts. None.

[count1] z [count2] type
    Redraw the screen with a window lines long, with line placed as specified by the character. If is not specified, it defaults to the current line. If is not specified, it defaults to the current window size.

    The following characters may be used:

  If
is specified, place the line at the top of the screen. Otherwise, display the screen after the current screen, similarly to the command. Place the line at the top of the screen. Place the line in the center of the screen. Place the line at the bottom of the screen. If is specified, place the line that is at the top of the screen when is at the bottom of the screen, at the bottom of the screen, i.e. display the screen before the screen before Otherwise, display the screen before the current screen, similarly to the command.

  Set to
unless is not specified and the character was either or in which case it is set to the line before the first line on the previous screen or the line after the last line on the previous screen, respectively. Set to the first nonblank character in the line. None.

[count] {
    Move backward paragraphs.

    The command is an absolute movement. The command may be used as the motion component of other commands, in which case any text copied into a buffer is character oriented, unless the starting character is the first character on its line, in which case it is line oriented.

  Set to the line containing the beginning of the previous paragraph.
Set to the first nonblank character in the line. Affected by the [paragraph] option.

[count] |
    Move to a specific position on the current line.

    The command may be used as the motion component of other commands, in which case any text copied into a buffer is character oriented. It is an error to use the command as a motion component and for the cursor not to move.

  Unchanged.
Set to the character occupying the column position identified by if the position exists in the line. If the column length of the current line is less than the cursor is moved to the last character in the line. None.

[count] }
    Move forward paragraphs.

    The command is an absolute movement. The command may be used as the motion component of other commands, in which case any text copied into a buffer is character oriented, unless the starting character is at or before any nonblank characters in its line, in which case it is line oriented.

  Set to the line containing the beginning of the next paragraph.
Set to the first nonblank character in the line. Affected by the [paragraph] option.

[count] ~
    Reverse the case of the next character(s). This is the historic semantic for the command and it is only in effect if the [tildeop] option is not set.

    Lowercase alphabetic characters are changed to uppercase, and uppercase characters are changed to lowercase. No other characters are affected.

    Historically, the command did not take an associated count, nor did it move past the end of the current line. As it had no associated motion it was difficult to change the case of large blocks of text. In if the cursor is on the last character of a line, and there are more lines in the file, the cursor moves to the next line.

    It is not an error to specify a count larger than the number of characters between the cursor and the end of the file.

  Set to the line of the character after
characters, or, end of file. Set to the character after characters, or, end-of-file. Affected by the [tildeop] option.

[count] ~ motion
    Reverse the case of the characters in a text region specified by the and Only in effect if the [tildeop] option is set.

    Lowercase characters are changed to uppercase, and uppercase characters are changed to lowercase. No other characters are affected.

  Set to the line of the character after the last character in the region.
Set to the character after the last character in the region. Affected by the [tildeop] option.

<interrupt>
    Interrupt the current operation. Many of the potentially long-running commands may be interrupted using the terminal interrupt character. These operations include searches, file reading and writing, filter operations and map character expansion. Interrupts are also enabled when running commands outside of

    If the character is used to interrupt while entering an command, the command is aborted, the cursor returns to its previous position, and remains in command mode.

    Generally, if the character is used to interrupt any operation, any changes made before the interrupt are left in place.

  Dependent on the operation being interrupted.
Dependent on the operation being interrupted. None.

1 Vi Text Input Commands
The following section describes the commands available in the text input mode of the editor. Historically, implementations only permitted the characters inserted on the current line to be erased. In addition, only the erase character and the and erase strings could erase autoindent characters. This implementation permits erasure to continue past the beginning of the current line, and back to where text input mode was entered. In addition, autoindent characters may be erased using the standard erase characters. For the line and word erase characters, reaching the autoindent characters forms a boundary, denoting the end of the current word or line erase. Repeating the word or line erase key will erase the autoindent characters. Historically, always used and as character and word erase characters, respectively, regardless of the current terminal settings. This implementation accepts, in addition to these two characters, the current terminal characters for those operations.

<nul>
    If the first character of the input is a the previous input is replayed, as if just entered.

<control-D>
    If the previous character on the line was an autoindent character, erase it. Otherwise, if the user is entering the first character in the line, is ignored. Otherwise, a literal character is entered.

^<control-D>
    If the previous character on the line was an autoindent character, erase all of the autoindent characters on the line. In addition, the autoindent level is reset to 0.

0<control-D>
    If the previous character on the line was an autoindent character, erase all of the autoindent characters on the line.

<control-T>
    Insert sufficient and characters to move the cursor forward to a column immediately after the next column which is an even multiple of the [shiftwidth] option.

    Historically, did not permit the command to be used unless the cursor was at the first column of a new line or it was preceded only by autoindent characters. permits it to be used at any time during insert mode.

<erase>
    Erase the last character.

<literal next>
    Quote the next character. The next character will not be mapped (see the command for more information) or interpreted specially. A carat character will be displayed immediately as a placeholder, but will be replaced by the next character.

<escape>
    Resolve all text input into the file, and return to command mode.

<line erase>
    Erase the current line.

<control-W>
    Erase the last word. The definition of word is dependent on the [altwerase] and [ttywerase] options.

<control-X>[0-9A-Fa-f]*
    Insert a character with the specified hexadecimal value into the text.

<interrupt>
    Interrupt text input mode, returning to command mode. If the character is used to interrupt inserting text into the file, it is as if the character was used; all text input up to the interruption is resolved into the file.