diff --git a/contrib/nvi/man/vi.1 b/contrib/nvi/man/vi.1
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 .\" Copyright (c) 1994
 .\"     The Regents of the University of California.  All rights reserved.
 .\" Copyright (c) 1994, 1995, 1996
 .\"	Keith Bostic.  All rights reserved.
 .\" Copyright (c) 2011
 .\"	Zhihao Yuan.  All rights reserved.
 .\"
 .\" The vi program is freely redistributable.
 .\" You are welcome to copy, modify and share it with others
 .\" under the conditions listed in the LICENSE file.
 .\" If any company (not individual!) finds vi sufficiently useful
 .\" that you would have purchased it, or if any company wishes to
 .\" redistribute it, contributions to the authors would be appreciated.
 .\"
-.Dd November 2, 2013
+.Dd September 25, 2020
 .Dt VI 1
 .Os
 .Sh NAME
 .Nm ex , vi , view
 .Nd text editors
 .Sh SYNOPSIS
 .Nm ex
 .Op Fl FRrSsv
 .Op Fl c Ar cmd
 .Op Fl t Ar tag
 .Op Fl w Ar size
 .Op Ar
 .Nm vi\ \&
 .Op Fl eFRrS
 .Op Fl c Ar cmd
 .Op Fl t Ar tag
 .Op Fl w Ar size
 .Op Ar
 .Nm view
 .Op Fl eFrS
 .Op Fl c Ar cmd
 .Op Fl t Ar tag
 .Op Fl w Ar size
 .Op Ar
 .Sh DESCRIPTION
 .Nm vi
 is a screen-oriented text editor.
 .Nm ex
 is a line-oriented text editor.
 .Nm ex
 and
 .Nm vi
 are different interfaces to the same program,
 and it is possible to switch back and forth during an edit session.
 .Nm view
 is the equivalent of using the
 .Fl R
 .Pq read-only
 option of
 .Nm vi .
 .Pp
 This manual page is the one provided with the
 .Nm nex Ns / Ns Nm nvi
 versions of the
 .Nm ex Ns / Ns Nm vi
 text editors.
 .Nm nex Ns / Ns Nm nvi
 are intended as bug-for-bug compatible replacements for the original
 Fourth Berkeley Software Distribution
 .Pq 4BSD
 .Nm ex
 and
 .Nm vi
 programs.
 For the rest of this manual page,
 .Nm nex Ns / Ns Nm nvi
 is used only when it's necessary to distinguish it from the historic
 implementations of
 .Nm ex Ns / Ns Nm vi .
 .Pp
 This manual page is intended for users already familiar with
 .Nm ex Ns / Ns Nm vi .
 Anyone else should almost certainly read a good tutorial on the
 editor before this manual page.
 If you're in an unfamiliar environment,
 and you absolutely have to get work done immediately,
 read the section after the options description, entitled
 .Sx FAST STARTUP .
 It's probably enough to get you going.
 .Pp
 The following options are available:
 .Bl -tag -width "-w size "
 .It Fl c Ar cmd
 Execute
 .Ar cmd
 on the first file loaded.
 Particularly useful for initial positioning in the file, although
 .Ar cmd
 is not limited to positioning commands.
 This is the POSIX 1003.2 interface for the historic
 .Dq +cmd
 syntax.
 .Nm nex Ns / Ns Nm nvi
 supports both the old and new syntax.
 .It Fl e
 Start editing in ex mode, as if the command name were
 .Nm ex .
 .It Fl F
 Don't copy the entire file when first starting to edit.
 (The default is to make a copy in case someone else modifies
 the file during your edit session.)
 .\" .It Fl l
 .\" Start editing with the lisp and showmatch options set.
 .It Fl R
 Start editing in read-only mode, as if the command name was
 .Nm view ,
 or the
 .Cm readonly
 option was set.
 .It Fl r
 Recover the specified files, or, if no files are specified,
 list the files that could be recovered.
 If no recoverable files by the specified name exist,
 the file is edited as if the
 .Fl r
 option had not been specified.
 .It Fl S
 Run with the
 .Cm secure
 edit option set, disallowing all access to external programs.
 .It Fl s
 Enter batch mode; applicable only to
 .Nm ex
 edit sessions.
 Batch mode is useful when running
 .Nm ex
 scripts.
 Prompts, informative messages and other user oriented messages are turned off,
 and no startup files or environment variables are read.
 This is the POSIX 1003.2 interface for the historic
 .Dq -
 argument.
 .Nm nex Ns / Ns Nm nvi
 supports both the old and new syntax.
 .It Fl t Ar tag
 Start editing at the specified
 .Ar tag
 .Pq see Xr ctags 1 .
 .It Fl v
 Start editing in vi mode, as if the command name was
 .Nm vi .
 .It Fl w Ar size
 Set the initial window size to the specified number of lines.
 .El
 .Pp
 Command input for
 .Nm ex Ns / Ns Nm vi
 is read from the standard input.
 In the
 .Nm vi
 interface, it is an error if standard input is not a terminal.
 In the
 .Nm ex
 interface, if standard input is not a terminal,
 .Nm ex
 will read commands from it regardless; however, the session will be a
 batch mode session, exactly as if the
 .Fl s
 option had been specified.
 .Sh FAST STARTUP
 This section will tell you the minimum amount that you need to
 do simple editing tasks using
 .Nm vi .
 If you've never used any screen editor before,
 you're likely to have problems even with this simple introduction.
 In that case you should find someone that already knows
 .Nm vi
 and have them walk you through this section.
 .Pp
 .Nm vi
 is a screen editor.
 This means that it takes up almost the entire screen,
 displaying part of the file on each screen line,
 except for the last line of the screen.
 The last line of the screen is used for you to give commands to
 .Nm vi ,
 and for
 .Nm vi
 to give information to you.
 .Pp
 The other fact that you need to understand is that
 .Nm vi
 is a modeful editor,
 i.e., you are either entering text or you are executing commands,
 and you have to be in the right mode to do one or the other.
 You will be in command mode when you first start editing a file.
 There are commands that switch you into input mode.
 There is only one key that takes you out of input mode,
 and that is the
 .Aq escape
 key.
 .Pp
 In this manual,
 key names are denoted with \(la and \(ra, e.g.,
 .Aq escape
 means the
 .Dq escape
 key, usually labeled
 .Dq Esc
 on your terminal's keyboard.
 If you're ever confused as to which mode you're in,
 keep entering the
 .Aq escape
 key until
 .Nm vi
 beeps at you.
 Generally,
 .Nm vi
 will beep at you if you try and do something that's not allowed.
 It will also display error messages.
 .Pp
 To start editing a file, enter the following command:
 .Pp
 .Dl $ vi file
 .Pp
 The command you should enter as soon as you start editing is:
 .Pp
 .Dl :set verbose showmode
 .Pp
 This will make the editor give you verbose error messages and display
 the current mode at the bottom of the screen.
 .Pp
 The commands to move around the file are:
 .Bl -tag -width Ds
 .It Cm h
 Move the cursor left one character.
 .It Cm j
 Move the cursor down one line.
 .It Cm k
 Move the cursor up one line.
 .It Cm l
 Move the cursor right one character.
 .It Aq Cm cursor-arrows
 The cursor arrow keys should work, too.
 .It Cm / Ns Ar text
 Search for the string
 .Dq Ar text
 in the file,
 and move the cursor to its first character.
 .El
 .Pp
 The commands to enter new text are:
 .Bl -tag -width "<escape>"
 .It Cm a
 Append new text, after the cursor.
 .It Cm i
 Insert new text, before the cursor.
 .It Cm o
 Open a new line below the line the cursor is on, and start entering text.
 .It Cm O
 Open a new line above the line the cursor is on, and start entering text.
 .It Aq Cm escape
 Once you've entered input mode using one of the
 .Cm a ,
 .Cm i ,
 .Cm o
 or
 .Cm O
 commands, use
 .Aq Cm escape
 to quit entering text and return to command mode.
 .El
 .Pp
 The commands to copy text are:
 .Bl -tag -width Ds
 .It Cm yy
 Copy the line the cursor is on.
 .It Cm p
 Append the copied line after the line the cursor is on.
 .El
 .Pp
 The commands to delete text are:
 .Bl -tag -width Ds
 .It Cm dd
 Delete the line the cursor is on.
 .It Cm x
 Delete the character the cursor is on.
 .El
 .Pp
 The commands to write the file are:
 .Bl -tag -width Ds
 .It Cm :w
 Write the file back to the file with the name that you originally used
 as an argument on the
 .Nm vi
 command line.
 .It Cm :w Ar file_name
 Write the file back to the file with the name
 .Ar file_name .
 .El
 .Pp
 The commands to quit editing and exit the editor are:
 .Bl -tag -width Ds
 .It Cm :q
 Quit editing and leave
 .Nm vi
 (if you've modified the file, but not saved your changes,
 .Nm vi
 will refuse to quit).
 .It Cm :q!
 Quit, discarding any modifications that you may have made.
 .El
 .Pp
 One final caution:
 Unusual characters can take up more than one column on the screen,
 and long lines can take up more than a single screen line.
 The above commands work on
 .Dq physical
 characters and lines,
 i.e., they affect the entire line no matter how many screen lines it takes up
 and the entire character no matter how many screen columns it takes up.
 .Sh REGULAR EXPRESSIONS
 .Nm ex Ns / Ns Nm vi
 supports regular expressions
 .Pq REs ,
 as documented in
 .Xr re_format 7 ,
 for line addresses, as the first part of the
 .Nm ex Cm substitute ,
 .Cm global
 and
 .Cm v
 commands, and in search patterns.
 Basic regular expressions
 .Pq BREs
 are enabled by default;
 extended regular expressions
 .Pq EREs
 are used if the
 .Cm extended
 option is enabled.
 The use of regular expressions can be largely disabled using the
 .Cm magic
 option.
 .Pp
 The following strings have special meanings in the
 .Nm ex Ns / Ns Nm vi
 version of regular expressions:
 .Bl -bullet -offset 6u
 .It
 An empty regular expression is equivalent to the last regular expression used.
 .It
 .Sq \e<
 matches the beginning of the word.
 .It
 .Sq \e>
 matches the end of the word.
 .It
 .Sq \(ti
 matches the replacement part of the last
 .Cm substitute
 command.
 .El
 .Sh BUFFERS
 A buffer is an area where commands can save changed or deleted text
 for later use.
 .Nm vi
 buffers are named with a single character preceded by a double quote,
 for example
 .Cm \&" Ns Aq Ar c ;
 .Nm ex
 buffers are the same,
 but without the double quote.
 .Nm nex Ns / Ns Nm nvi
 permits the use of any character without another meaning in the position where
 a buffer name is expected.
 .Pp
 All buffers are either in
 .Em line mode
 or
 .Em character mode .
 Inserting a buffer in line mode into the text creates new lines for each of the
 lines it contains, while a buffer in character mode creates new lines for any
 lines
 .Em other
 than the first and last lines it contains.
 The first and last lines are inserted at the current cursor position, becoming
 part of the current line.
 If there is more than one line in the buffer,
 the current line itself will be split.
 All
 .Nm ex
 commands which store text into buffers do so in line mode.
 The behaviour of
 .Nm vi
 commands depend on their associated motion command:
 .Bl -bullet -offset 6u
 .It
 .Aq Cm control-A ,
 .Cm h ,
 .Cm l ,
 .Cm ,\& ,
 .Cm 0 ,
 .Cm B ,
 .Cm E ,
 .Cm F ,
 .Cm T ,
 .Cm W ,
 .Cm \(ha ,
 .Cm b ,
 .Cm e ,
 .Cm f
 and
 .Cm t
 make the destination buffer character-oriented.
 .It
 .Cm j ,
 .Aq Cm control-M ,
 .Cm k ,
 .Cm \(aq ,
 .Cm - ,
 .Cm G ,
 .Cm H ,
 .Cm L ,
 .Cm M ,
 .Cm _
 and
 .Cm |\&
 make the destination buffer line-oriented.
 .It
 .Cm $ ,
 .Cm % ,
 .Cm \` ,
 .Cm (\& ,
 .Cm )\& ,
 .Cm / ,
 .Cm ?\& ,
 .Cm [[ ,
 .Cm ]] ,
 .Cm {
 and
 .Cm }
 make the destination buffer character-oriented, unless the starting and
 end positions are the first and last characters on a line.
 In that case, the buffer is line-oriented.
 .El
 .Pp
 The
 .Nm ex
 command
 .Cm display buffers
 displays the current mode for each buffer.
 .Pp
 Buffers named
 .Sq a
 through
 .Sq z
 may be referred to using their uppercase equivalent, in which case new content
 will be appended to the buffer, instead of replacing it.
 .Pp
 Buffers named
 .Sq 1
 through
 .Sq 9
 are special.
 A region of text modified using the
 .Cm c
 .Pq change
 or
 .Cm d
 .Pq delete
 commands is placed into the numeric buffer
 .Sq 1
 if no other buffer is specified and if it meets one of the following conditions:
 .Bl -bullet -offset 6u
 .It
 It includes characters from more than one line.
 .It
 It is specified using a line-oriented motion.
 .It
 It is specified using one of the following motion commands:
 .Aq Cm control-A ,
 .Cm \` Ns Aq Ar character ,
 .Cm n ,
 .Cm N ,
 .Cm % ,
 .Cm / ,
 .Cm { ,
 .Cm } ,
 .Cm \&( ,
 .Cm \&) ,
 and
 .Cm \&? .
 .El
 .Pp
 Before this copy is done, the previous contents of buffer
 .Sq 1
 are moved into buffer
 .Sq 2 ,
 .Sq 2
 into buffer
 .Sq 3 ,
 and so on.
 The contents of buffer
 .Sq 9
 are discarded.
 Note that this rotation occurs
 .Em regardless
 of the user specifying another buffer.
 In
 .Nm vi ,
 text may be explicitly stored into the numeric buffers.
 In this case, the buffer rotation occurs before the replacement of the buffer's
 contents.
 The numeric buffers are only available in
 .Nm vi
 mode.
 .Sh VI COMMANDS
 The following section describes the commands available in the command
 mode of the
 .Nm vi
 editor.
 The following words have a special meaning in the commands description:
 .Pp
 .Bl -tag -width bigword -compact -offset 3u
 .It Ar bigword
 A set of non-whitespace characters.
 .It Ar buffer
 Temporary area where commands may place text.
 If not specified, the default buffer is used.
 See also
 .Sx BUFFERS ,
 above.
 .It Ar count
 A positive number used to specify the desired number of iterations
 of a command.
 It defaults to 1 if not specified.
 .It Ar motion
 A cursor movement command which indicates the other end of the affected region
 of text, the first being the current cursor position.
 Repeating the command character makes it affect the whole current line.
 .It Ar word
 A sequence of letters, digits or underscores.
 .El
 .Pp
 .Ar buffer
 and
 .Ar count ,
 if both present, may be specified in any order.
 .Ar motion
 and
 .Ar count ,
 if both present, are effectively multiplied together
 and considered part of the motion.
 .Pp
 .Bl -tag -width Ds -compact
 .It Xo
 .Aq Cm control-A
 .Xc
 Search forward
 for the word starting at the cursor position.
 .Pp
 .It Xo
 .Op Ar count
 .Aq Cm control-B
 .Xc
 Page backwards
 .Ar count
 screens.
 Two lines of overlap are maintained, if possible.
 .Pp
 .It Xo
 .Op Ar count
 .Aq Cm control-D
 .Xc
 Scroll forward
 .Ar count
 lines.
 If
 .Ar count
 is not given, scroll forward the number of lines specified by the last
 .Aq Cm control-D
 or
 .Aq Cm control-U
 command.
 If this is the first
 .Aq Cm control-D
 command, scroll half the number of lines in the current screen.
 .Pp
 .It Xo
 .Op Ar count
 .Aq Cm control-E
 .Xc
 Scroll forward
 .Ar count
 lines, leaving the current line and column as is, if possible.
 .Pp
 .It Xo
 .Op Ar count
 .Aq Cm control-F
 .Xc
 Page forward
 .Ar count
 screens.
 Two lines of overlap are maintained, if possible.
 .Pp
 .It Aq Cm control-G
 Display the following file information:
 the file name
 .Pq as given to Nm vi ;
 whether the file has been modified since it was last written;
 if the file is read-only;
 the current line number;
 the total number of lines in the file;
 and the current line number as a percentage of the total lines in the file.
 .Pp
 .It Xo
 .Op Ar count
 .Aq Cm control-H
 .Xc
 .It Xo
 .Op Ar count
 .Cm h
 .Xc
 Move the cursor back
 .Ar count
 characters in the current line.
 .Pp
 .It Xo
 .Op Ar count
 .Aq Cm control-J
 .Xc
 .It Xo
 .Op Ar count
 .Aq Cm control-N
 .Xc
 .It Xo
 .Op Ar count
 .Cm j
 .Xc
 Move the cursor down
 .Ar count
 lines without changing the current column.
 .Pp
 .It Aq Cm control-L
 .It Aq Cm control-R
 Repaint the screen.
 .Pp
 .It Xo
 .Op Ar count
 .Aq Cm control-M
 .Xc
 .It Xo
 .Op Ar count
 .Cm +
 .Xc
 Move the cursor down
 .Ar count
 lines to the first non-blank character of that line.
 .Pp
 .It Xo
 .Op Ar count
 .Aq Cm control-P
 .Xc
 .It Xo
 .Op Ar count
 .Cm k
 .Xc
 Move the cursor up
 .Ar count
 lines, without changing the current column.
 .Pp
 .It Aq Cm control-T
 Return to the most recent tag context.
 .Pp
 .It Xo
 .Op Ar count
 .Aq Cm control-U
 .Xc
 Scroll backwards
 .Ar count
 lines.
 If
 .Ar count
 is not given, scroll backwards the number of lines specified by the last
 .Aq Cm control-D
 or
 .Aq Cm control-U
 command.
 If this is the first
 .Aq Cm control-U
 command, scroll half the number of lines in the current screen.
 .Pp
 .It Aq Cm 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.
 .Pp
 .It Xo
 .Op Ar count
 .Aq Cm control-Y
 .Xc
 Scroll backwards
 .Ar count
 lines, leaving the current line and column as is, if possible.
 .Pp
 .It Aq Cm control-Z
 Suspend the current editor session.
 .Pp
 .It Aq Cm escape
 Execute the
 .Nm ex
 command being entered, or cancel it if it is only partial.
 .Pp
 .It Aq Cm control-]
 Push a tag reference onto the tag stack.
 .Pp
 .It Aq Cm control-\(ha
 Switch to the most recently edited file.
 .Pp
 .It Xo
 .Op Ar count
 .Aq Cm space
 .Xc
 .It Xo
 .Op Ar count
 .Cm l
 .Xc
 Move the cursor forward
 .Ar count
 characters without changing the current line.
 .Pp
 .It Xo
 .Op Ar count
 .Cm !\&
 .Ar motion shell-argument(s)
 .Aq Li carriage-return
 .Xc
 Replace the lines spanned by
 .Ar count
 and
 .Ar motion
 with the output
 .Pq standard output and standard error
 of the program named by the
 .Cm shell
 option, called with a
 .Fl c
 flag followed by the
 .Ar shell-argument(s)
 .Pq bundled into a single argument .
 Within
 .Ar shell-argument(s) ,
 the
 .Sq % ,
 .Sq #
 and
 .Sq !\&
 characters are expanded to the current file name,
 the previous current file name,
 and the command text of the previous
 .Cm !\&
 or
 .Cm :!
 commands, respectively.
 The special meaning of
 .Sq % ,
 .Sq #
 and
 .Sq !\&
 can be overridden by escaping them with a backslash.
 .Pp
 .It Xo
 .Op Ar count
 .Cm #
 .Sm off
 .Cm # | + | -
 .Sm on
 .Xc
 Increment
 .Pq trailing So # Sc or So + Sc
 or decrement
 .Pq trailing Sq -
 the number under the cursor by
 .Ar count ,
 starting at the cursor position or at the first non-blank
 character following it.
 Numbers with a leading
 .Sq 0x
 or
 .Sq 0X
 are interpreted as hexadecimal numbers.
 Numbers with a leading
 .Sq 0
 are interpreted as octal numbers unless they contain a non-octal digit.
 Other numbers may be prefixed with a
 .Sq +
 or
 .Sq -
 sign.
 .Pp
 .It Xo
 .Op Ar count
 .Cm $
 .Xc
 Move the cursor to the end of a line.
 If
 .Ar count
 is specified, additionally move the cursor down
 .Ar count
 \(mi 1 lines.
 .Pp
 .It Cm %
 Move to the
 .Cm matchchars
 character matching
 the one found at the cursor position or the closest to the right of it.
 .Pp
 .It Cm &
 Repeat the previous substitution command on the current line.
 .Pp
 .It Xo
 .Cm \(aq Ns Aq Ar character
 .Xc
 .It Xo
 .Cm \` Ns Aq Ar character
 .Xc
 Return to the cursor position marked by the character
 .Ar character ,
 or, if
 .Ar character
 is
 .Sq \(aq
 or
 .Sq \` ,
 to the position of the cursor before the last of the following commands:
 .Aq Cm control-A ,
 .Aq Cm control-T ,
 .Aq Cm control-] ,
 .Cm % ,
 .Cm \(aq ,
 .Cm \` ,
 .Cm (\& ,
 .Cm )\& ,
 .Cm / ,
 .Cm ?\& ,
 .Cm G ,
 .Cm H ,
 .Cm L ,
 .Cm [[ ,
 .Cm ]] ,
 .Cm { ,
 .Cm } .
 The first form returns to the first non-blank character of the line marked by
 .Ar character .
 The second form returns to the line and column marked by
 .Ar character .
 .Pp
 .It Xo
 .Op Ar count
 .Cm \&(
 .Xc
 .It Xo
 .Op Ar count
 .Cm \&)
 .Xc
 Move
 .Ar count
 sentences backward or forward, respectively.
 A sentence is an area of text that begins with the first nonblank character
 following the previous sentence, paragraph, or section
 boundary and continues until the next period, exclamation point,
 or question mark character, followed by any number of closing parentheses,
 brackets, double or single quote characters, followed by
 either an end-of-line or two whitespace characters.
 Groups of empty lines
 .Pq or lines containing only whitespace characters
 are treated as a single sentence.
 .Pp
 .It Xo
 .Op Ar count
 .Cm ,\&
 .Xc
 Reverse find character
 .Pq i.e., the last Cm F , f , T No or Cm t No command
 .Ar count
 times.
 .Pp
 .It Xo
 .Op Ar count
 .Cm -
 .Xc
 Move to the first non-blank character of the previous line,
 .Ar count
 times.
 .Pp
 .It Xo
 .Op Ar count
 .Cm .\&
 .Xc
 Repeat the last
 .Nm vi
 command that modified text.
 .Ar count
 replaces both the
 .Ar count
 argument of the repeated command and that of the associated
 .Ar motion .
 If the
 .Cm .\&
 command repeats the
 .Cm u
 command, the change log is rolled forward or backward, depending on the action
 of the
 .Cm u
 command.
 .Pp
 .It Xo
 .Pf / Ns Ar RE
 .Aq Li carriage-return
 .Xc
 .It Xo
 .Pf / Ns Ar RE Ns /
 .Op Ar offset
 .Op Cm z
 .Aq Li carriage-return
 .Xc
 .It Xo
 .Pf ?\& Ns Ar RE
 .Aq Li carriage-return
 .Xc
 .It Xo
 .Pf ?\& Ns Ar RE Ns ?\&
 .Op Ar offset
 .Op Cm z
 .Aq Li carriage-return
 .Xc
 .It Cm N
 .It Cm n
 Search forward
 .Pq Sq /
 or backward
 .Pq Sq ?\&
 for a regular expression.
 .Cm n
 and
 .Cm N
 repeat the last search in the same or opposite directions, respectively.
 If
 .Ar RE
 is empty, the last search regular expression is used.
 If
 .Ar offset
 is specified, the cursor is placed
 .Ar offset
 lines before or after the matched regular expression.
 If either
 .Cm n
 or
 .Cm N
 commands are used as motion components for the
 .Cm !\&
 command, there will be no prompt for the text of the command and the previous
 .Cm !\&
 will be executed.
 Multiple search patterns may be grouped together by delimiting them with
 semicolons and zero or more whitespace characters.
 These patterns are evaluated from left to right with the final cursor position
 determined by the last search pattern.
 A
 .Cm z
 command may be appended to the closed search expressions to reposition the
 result line.
 .Pp
 .It Cm 0
 Move to the first character in the current line.
 .Pp
 .It Cm :\&
 Execute an
 .Nm ex
 command.
 .Pp
 .It Xo
 .Op Ar count
 .Cm ;\&
 .Xc
 Repeat the last character find
 (i.e., the last
 .Cm F , f , T
 or
 .Cm t
 command)
 .Ar count
 times.
 .Pp
 .It Xo
 .Op Ar count
 .Cm <
 .Ar motion
 .Xc
 .It Xo
 .Op Ar count
 .Cm >
 .Ar motion
 .Xc
 Shift
 .Ar count
 lines left or right, respectively, by an amount of
 .Cm shiftwidth .
 .Pp
 .It Cm @ Ar buffer
 Execute a named
 .Ar buffer
 as
 .Nm vi
 commands.
 The buffer may include
 .Nm ex
 commands too, but they must be expressed as a
 .Cm \&:
 command.
 If
 .Ar buffer
 is
 .Sq @
 or
 .Sq * ,
 then the last buffer executed shall be used.
 .Pp
 .It Xo
 .Op Ar count
 .Cm A
 .Xc
 Enter input mode, appending the text after the end of the line.
 If a
 .Ar count
 argument is given, the characters input are repeated
 .Ar count
 \(mi 1 times after input mode is exited.
 .Pp
 .It Xo
 .Op Ar count
 .Cm B
 .Xc
 Move backwards
 .Ar count
 bigwords.
 .Pp
 .It Xo
 .Op Ar buffer
 .Cm C
 .Xc
 Change text from the current position to the end-of-line.
 If
 .Ar buffer
 is specified,
 .Dq yank
 the deleted text into
 .Ar buffer .
 .Pp
 .It Xo
 .Op Ar buffer
 .Cm D
 .Xc
 Delete text from the current position to the end-of-line.
 If
 .Ar buffer
 is specified,
 .Dq yank
 the deleted text into
 .Ar buffer .
 .Pp
 .It Xo
 .Op Ar count
 .Cm E
 .Xc
 Move forward
 .Ar count
 end-of-bigwords.
 .Pp
 .It Xo
 .Op Ar count
 .Cm F Aq Ar character
 .Xc
 Search
 .Ar count
 times backward through the current line for
 .Aq Ar character .
 .Pp
 .It Xo
 .Op Ar count
 .Cm G
 .Xc
 Move to line
 .Ar count ,
 or the last line of the file if
 .Ar count
 is not specified.
 .Pp
 .It Xo
 .Op Ar count
 .Cm H
 .Xc
 Move to the screen line
 .Ar count
 \(mi 1 lines below the top of the screen.
 .Pp
 .It Xo
 .Op Ar count
 .Cm I
 .Xc
 Enter input mode, inserting the text at the beginning of the line.
 If a
 .Ar count
 argument is given,
 the characters input are repeated
 .Ar count
 \(mi 1 more times.
 .Pp
 .It Xo
 .Op Ar count
 .Cm J
 .Xc
 Join
 .Ar count
 lines with the current line.
 The spacing between two joined lines is set to two whitespace characters if the
 former ends with a question mark, a period or an exclamation point.
 It is set to one whitespace character otherwise.
 .Pp
 .It Xo
 .Op Ar count
 .Cm L
 .Xc
 Move to the screen line
 .Ar count
 \(mi 1 lines above the bottom of the screen.
 .Pp
 .It Cm M
 Move to the screen line in the middle of the screen.
 .Pp
 .It Xo
 .Op Ar count
 .Cm O
 .Xc
 Enter input mode, appending text in a new line above the current line.
 If a
 .Ar count
 argument is given,
 the characters input are repeated
 .Ar count
 \(mi 1 more times.
 .Pp
 .It Xo
 .Op Ar buffer
 .Cm P
 .Xc
 Insert text from
 .Ar buffer
 before the current column if
 .Ar buffer
 is character-oriented or before the current line if it is line-oriented.
 .Pp
 .It Cm Q
 Exit
 .Nm vi
 .Pq or visual
 mode and switch to
 .Nm ex
 mode.
 .Pp
 .It Xo
 .Op Ar count
 .Cm R
 .Xc
 Enter input mode, replacing the characters in the current line.
 If a
 .Ar count
 argument is given,
 the characters input are repeated
 .Ar count
 \(mi 1 more times upon exit from insert mode.
 .Pp
 .It Xo
 .Op Ar buffer
 .Op Ar count
 .Cm S
 .Xc
 Substitute
 .Ar count
 lines.
 If
 .Ar buffer
 is specified,
 .Dq yank
 the deleted text into
 .Ar buffer .
 .Pp
 .It Xo
 .Op Ar count
 .Cm T
 .Aq Ar character
 .Xc
 Search backwards,
 .Ar count
 times, through the current line for the character after the specified
 .Aq Ar character .
 .Pp
 .It Cm U
 Restore the current line to its state before the cursor last moved to it.
 .Pp
 .It Xo
 .Op Ar count
 .Cm W
 .Xc
 Move forward
 .Ar count
 bigwords.
 .Pp
 .It Xo
 .Op Ar buffer
 .Op Ar count
 .Cm X
 .Xc
 Delete
 .Ar count
 characters before the cursor, on the current line.
 If
 .Ar buffer
 is specified,
 .Dq yank
 the deleted text into
 .Ar buffer .
 .Pp
 .It Xo
 .Op Ar buffer
 .Op Ar count
 .Cm Y
 .Xc
 Copy
 .Pq or Dq yank
 .Ar count
 lines into
 .Ar buffer .
 .Pp
 .It Cm ZZ
 Write the file and exit
 .Nm vi
 if there are no more files to edit.
 Entering two
 .Dq quit
 commands in a row ignores any remaining file to edit.
 .Pp
 .It Xo
 .Op Ar count
 .Cm [[
 .Xc
 Back up
 .Ar count
 section boundaries.
 .Pp
 .It Xo
 .Op Ar count
 .Cm ]]
 .Xc
 Move forward
 .Ar count
 section boundaries.
 .Pp
 .It Cm \(ha
 Move to the first non-blank character on the current line.
 .Pp
 .It Xo
 .Op Ar count
 .Cm _
 .Xc
 Move down
 .Ar count
 \(mi 1 lines, to the first non-blank character.
 .Pp
 .It Xo
 .Op Ar count
 .Cm a
 .Xc
 Enter input mode, appending the text after the cursor.
 If a
 .Ar count
 argument is given,
 the characters input are repeated
 .Ar count
 number of times.
 .Pp
 .It Xo
 .Op Ar count
 .Cm b
 .Xc
 Move backwards
 .Ar count
 words.
 .Pp
 .It Xo
 .Op Ar buffer
 .Op Ar count
 .Cm c
 .Ar motion
 .Xc
 Change the region of text described by
 .Ar count
 and
 .Ar motion .
 If
 .Ar buffer
 is specified,
 .Dq yank
 the changed text into
 .Ar buffer .
 .Pp
 .It Xo
 .Op Ar buffer
 .Op Ar count
 .Cm d
 .Ar motion
 .Xc
 Delete the region of text described by
 .Ar count
 and
 .Ar motion .
 If
 .Ar buffer
 is specified,
 .Dq yank
 the deleted text into
 .Ar buffer .
 .Pp
 .It Xo
 .Op Ar count
 .Cm e
 .Xc
 Move forward
 .Ar count
 end-of-words.
 .Pp
 .It Xo
 .Op Ar count
 .Cm f Aq Ar character
 .Xc
 Search forward,
 .Ar count
 times, through the rest of the current line for
 .Aq Ar character .
 .Pp
 .It Xo
 .Op Ar count
 .Cm i
 .Xc
 Enter input mode, inserting the text before the cursor.
 If a
 .Ar count
 argument is given,
 the characters input are repeated
 .Ar count
 number of times.
 .Pp
 .It Xo
 .Cm m
 .Aq Ar character
 .Xc
 Save the current context
 .Pq line and column
 as
 .Aq Ar character .
 .Pp
 .It Xo
 .Op Ar count
 .Cm o
 .Xc
 Enter input mode, appending text in a new line under the current line.
 If a
 .Ar count
 argument is given,
 the characters input are repeated
 .Ar count
 \(mi 1 more times.
 .Pp
 .It Xo
 .Op Ar buffer
 .Cm p
 .Xc
 Append text from
 .Ar buffer .
 Text is appended after the current column if
 .Ar buffer
 is character oriented, or after the current line otherwise.
 .Pp
 .It Xo
 .Op Ar count
 .Cm r
 .Aq Ar character
 .Xc
 Replace
 .Ar count
 characters with
 .Ar character .
 .Pp
 .It Xo
 .Op Ar buffer
 .Op Ar count
 .Cm s
 .Xc
 Substitute
 .Ar count
 characters in the current line starting with the current character.
 If
 .Ar buffer
 is specified,
 .Dq yank
 the substituted text into
 .Ar buffer .
 .Pp
 .It Xo
 .Op Ar count
 .Cm t
 .Aq Ar character
 .Xc
 Search forward,
 .Ar count
 times, through the current line for the character immediately before
 .Aq Ar character .
 .Pp
 .It Cm u
 Undo the last change made to the file.
 If repeated, the
 .Cm u
 command alternates between these two states.
 The
 .Cm .\&
 command, when used immediately after
 .Cm u ,
 causes the change log to be rolled forward or backward, depending on the action
 of the
 .Cm u
 command.
 .Pp
 .It Xo
 .Op Ar count
 .Cm w
 .Xc
 Move forward
 .Ar count
 words.
 .Pp
 .It Xo
 .Op Ar buffer
 .Op Ar count
 .Cm x
 .Xc
 Delete
 .Ar count
 characters at the current cursor position, but no more than there are till the
 end of the line.
 .Pp
 .It Xo
 .Op Ar buffer
 .Op Ar count
 .Cm y
 .Ar motion
 .Xc
 Copy
 .Pq or Dq yank
 a text region specified by
 .Ar count
 and
 .Ar motion
 into a buffer.
 .Pp
 .It Xo
 .Op Ar count1
 .Cm z
 .Op Ar count2
 .Cm type
 .Xc
 Redraw, optionally repositioning and resizing the screen.
 If
 .Ar count2
 is specified, limit the screen size to
 .Ar count2
 lines.
 The following
 .Cm type
 characters may be used:
 .Bl -tag -width Ds
 .It Cm +
 If
 .Ar count1
 is specified, place the line
 .Ar count1
 at the top of the screen.
 Otherwise, display the screen after the current screen.
 .It Aq Cm carriage-return
 Place the line
 .Ar count1
 at the top of the screen.
 .It Cm .\&
 Place the line
 .Ar count1
 in the center of the screen.
 .It Cm -
 Place the line
 .Ar count1
 at the bottom of the screen.
 .It Cm \(ha
 If
 .Ar count1
 is given,
 display the screen before the screen before
 .Ar count1
 .Pq i.e., 2 screens before .
 Otherwise, display the screen before the current screen.
 .El
 .Pp
 .It Xo
 .Op Ar count
 .Cm {\&
 .Xc
 Move backward
 .Ar count
 paragraphs.
 .Pp
 .It Xo
 .Op Ar column
 .Cm |\&
 .Xc
 Move to a specific
 .Ar column
 position on the current line.
 If
 .Ar column
 is omitted,
 move to the start of the current line.
 .Pp
 .It Xo
 .Op Ar count
 .Cm }\&
 .Xc
 Move forward
 .Ar count
 paragraphs.
 .Pp
 .It Xo
 .Op Ar count
 .Cm \(ti
 .Ar motion
 .Xc
 If the
 .Cm tildeop
 option is not set, reverse the case of the next
 .Ar count
 character(s) and no
 .Ar motion
 can be specified.
 Otherwise
 .Ar motion
 is mandatory and
 .Cm \(ti
 reverses the case of the characters in a text region specified by the
 .Ar count
 and
 .Ar motion .
 .Pp
 .It Aq Cm interrupt
 Interrupt the current operation.
 The
 .Aq interrupt
 character is usually
 .Aq control-C .
 .El
 .Sh VI TEXT INPUT COMMANDS
 The following section describes the commands available in the text input mode
 of the
 .Nm vi
 editor.
 .Pp
 .Bl -tag -width Ds -compact
 .It Aq Cm nul
 Replay the previous input.
 .Pp
 .It Aq Cm control-D
 Erase to the previous
 .Ar shiftwidth
 column boundary.
 .Pp
 .It Cm \(ha Ns Aq Cm control-D
 Erase all of the autoindent characters, and reset the autoindent level.
 .Pp
 .It Cm 0 Ns Aq Cm control-D
 Erase all of the autoindent characters.
 .Pp
 .It Aq Cm control-T
 Insert sufficient
 .Aq tab
 and
 .Aq space
 characters to move forward to the next
 .Ar shiftwidth
 column boundary.
 If the
 .Cm expandtab
 option is set, only insert
 .Aq space
 characters.
 .Pp
 .It Aq Cm erase
 .It Aq Cm control-H
 Erase the last character.
 .Pp
 .It Aq Cm literal next
 Escape the next character from any special meaning.
 The
 .Aq literal\ \&next
 character is usually
 .Aq control-V .
 .Pp
 .It Aq Cm escape
 Resolve all text input into the file, and return to command mode.
 .Pp
 .It Aq Cm line erase
 Erase the current line.
 .Pp
 .It Aq Cm control-W
 .It Aq Cm word erase
 Erase the last word.
 The definition of word is dependent on the
 .Cm altwerase
 and
 .Cm ttywerase
 options.
 .Pp
 .Sm off
 .It Xo
 .Aq Cm control-X
 .Bq Cm 0-9A-Fa-f
 .Cm +
 .Xc
 .Sm on
 Insert a character with the specified hexadecimal value into the text.
 .Pp
 .It Aq Cm interrupt
 Interrupt text input mode, returning to command mode.
 The
 .Aq interrupt
 character is usually
 .Aq control-C .
 .El
 .Sh EX COMMANDS
 The following section describes the commands available in the
 .Nm ex
 editor.
 In each entry below, the tag line is a usage synopsis for the command.
 .Pp
 .Bl -tag -width Ds -compact
 .It Aq Cm end-of-file
 Scroll the screen.
 .Pp
 .It Cm !\& Ar argument(s)
 .It Xo
 .Op Ar range
 .Cm !\&
 .Ar argument(s)
 .Xc
 Execute a shell command, or filter lines through a shell command.
 .Pp
 .It Cm \&"
 A comment.
 .Pp
 .It Xo
 .Op Ar range
 .Cm nu Ns Op Cm mber
 .Op Ar count
 .Op Ar flags
 .Xc
 .It Xo
 .Op Ar range
 .Cm #
 .Op Ar count
 .Op Ar flags
 .Xc
 Display the selected lines, each preceded with its line number.
 .Pp
 .It Cm @ Ar buffer
 .It Cm * Ar buffer
 Execute a buffer.
 .Pp
 .It Xo
 .Op Ar range
 .Cm < Ns Op Cm < ...
 .Op Ar count
 .Op Ar flags
 .Xc
 Shift lines left.
 .Pp
 .It Xo
 .Op Ar line
 .Cm =
 .Op Ar flags
 .Xc
 Display the line number of
 .Ar line .
 If
 .Ar line
 is not specified, display the line number of the last line in the file.
 .Pp
 .It Xo
 .Op Ar range
 .Cm > Ns Op Cm > ...
 .Op Ar count
 .Op Ar flags
 .Xc
 Shift lines right.
 .Pp
 .It Xo
 .Cm ab Ns Op Cm breviate
 .Ar lhs rhs
 .Xc
 .Nm vi
 only.
 Add
 .Ar lhs
 as an abbreviation for
 .Ar rhs
 to the abbreviation list.
 .Pp
 .It Xo
 .Op Ar line
 .Cm a Ns Op Cm ppend Ns
 .Op Cm !\&
 .Xc
 The input text is appended after the specified line.
 .Pp
 .It Cm ar Ns Op Cm gs
 Display the argument list.
 .Pp
 .It Cm bg
 .Nm vi
 only.
 Background the current screen.
 .Pp
 .It Xo
 .Op Ar range
 .Cm c Ns Op Cm hange Ns
 .Op Cm !\&
 .Op Ar count
 .Xc
 The input text replaces the specified range.
 .Pp
 .It Xo
 .Cm chd Ns Op Cm ir Ns
 .Op Cm !\&
 .Op Ar directory
 .Xc
 .It Xo
 .Cm cd Ns Op Cm !\&
 .Op Ar directory
 .Xc
 Change the current working directory.
 .Pp
 .It Xo
 .Op Ar range
 .Cm co Ns Op Cm py
 .Ar line
 .Op Ar flags
 .Xc
 .It Xo
 .Op Ar range
 .Cm t
 .Ar line
 .Op Ar flags
 .Xc
 Copy the specified lines after the destination
 .Ar line .
 .Pp
 .It Xo
 .Cm cs Ns Op Cm cope
 .Cm add | find | help | kill | reset
 .Xc
 Execute a Cscope command.
 .Pp
 .It Xo
 .Op Ar range
 .Cm d Ns Op Cm elete
 .Op Ar buffer
 .Op Ar count
 .Op Ar flags
 .Xc
 Delete the lines from the file.
 .Pp
 .It Xo
 .Cm di Ns Op Cm splay
 .Cm b Ns Oo Cm uffers Oc |
 .Cm c Ns Oo Cm onnections Oc |
 .Cm s Ns Oo Cm creens Oc |
 .Cm t Ns Op Cm ags
 .Xc
 Display buffers, Cscope connections, screens or tags.
 .Pp
 .It Xo
 .Op Cm Ee Ns
 .Op Cm dit Ns
 .Op Cm !\&
 .Op Ar +cmd
 .Op Ar file
 .Xc
 .It Xo
 .Op Cm Ee Ns
 .Cm x Ns Op Cm !\&
 .Op Ar +cmd
 .Op Ar file
 .Xc
 Edit a different file.
 .Pp
 .It Xo
 .Cm exu Ns Op Cm sage
 .Op Ar command
 .Xc
 Display usage for an
 .Nm ex
 command.
 .Pp
 .It Xo
 .Cm f Ns Op Cm ile
 .Op Ar file
 .Xc
 Display and optionally change the file name.
 .Pp
 .It Xo
 .Op Cm Ff Ns
 .Cm g
 .Op Ar name
 .Xc
 .Nm vi
 mode only.
 Foreground the specified screen.
 .Pp
 .It Xo
 .Op Ar range
 .Cm g Ns Op Cm lobal
 .No / Ns Ar pattern Ns /
 .Op Ar commands
 .Xc
 .It Xo
 .Op Ar range
 .Cm v
 .No / Ns Ar pattern Ns /
 .Op Ar commands
 .Xc
 Apply commands to lines matching
 .Pq Sq global
 or not matching
 .Pq Sq v
 a pattern.
 .Pp
 .It Cm he Ns Op Cm lp
 Display a help message.
 .Pp
 .It Xo
 .Op Ar line
 .Cm i Ns Op Cm nsert Ns
 .Op Cm !\&
 .Xc
 The input text is inserted before the specified line.
 .Pp
 .It Xo
 .Op Ar range
 .Cm j Ns Op Cm oin Ns
 .Op Cm !\&
 .Op Ar count
 .Op Ar flags
 .Xc
 Join lines of text together.
 .Pp
 .It Xo
 .Op Ar range
 .Cm l Ns Op Cm ist
 .Op Ar count
 .Op Ar flags
 .Xc
 Display the lines unambiguously.
 .Pp
 .It Xo
 .Cm map Ns Op Cm !\&
 .Op Ar lhs rhs
 .Xc
 Define or display maps
 .Pq for Nm vi No only .
 .Pp
 .It Xo
 .Op Ar line
 .Cm ma Ns Op Cm rk
 .Aq Ar character
 .Xc
 .It Xo
 .Op Ar line
 .Cm k Aq Ar character
 .Xc
 Mark the line with the mark
 .Aq Ar character .
 .Pp
 .It Xo
 .Op Ar range
 .Cm m Ns Op Cm ove
 .Ar line
 .Xc
 Move the specified lines after the target line.
 .Pp
 .It Xo
 .Cm mk Ns Op Cm exrc Ns
 .Op Cm !\&
 .Ar file
 .Xc
 Write the abbreviations, editor options and maps to the specified
 .Ar file .
 .Pp
 .It Xo
 .Op Cm Nn Ns
 .Op Cm ext Ns
 .Op Cm !\&
 .Op Ar
 .Xc
 Edit the next file from the argument list.
 .\" .Pp
 .\" .It Xo
 .\" .Op Ar line
 .\" .Cm o Ns Op Cm pen
 .\" .No / Ns Ar pattern Ns /
 .\" .Op Ar flags
 .\" .Xc
 .\" Enter open mode.
 .Pp
 .It Cm pre Ns Op Cm serve
 Save the file in a form that can later be recovered using the
 .Nm ex
 .Fl r
 option.
 .Pp
 .It Xo
 .Op Cm \&Pp Ns
 .Cm rev Ns Op Cm ious Ns
 .Op Cm !\&
 .Xc
 Edit the previous file from the argument list.
 .Pp
 .It Xo
 .Op Ar range
 .Cm p Ns Op Cm rint
 .Op Ar count
 .Op Ar flags
 .Xc
 Display the specified lines.
 .Pp
 .It Xo
 .Op Ar line
 .Cm pu Ns Op Cm t
 .Op Ar buffer
 .Xc
 Append buffer contents to the current line.
 .Pp
 .It Xo
 .Cm q Ns Op Cm uit Ns
 .Op Cm !\&
 .Xc
 End the editing session.
 .Pp
 .It Xo
 .Op Ar line
 .Cm r Ns Op Cm ead Ns
 .Op Cm !\&
 .Op Ar file
 .Xc
 Read a file.
 .Pp
 .It Xo
 .Cm rec Ns Op Cm over
 .Ar file
 .Xc
 Recover
 .Ar file
 if it was previously saved.
 .Pp
 .It Xo
 .Cm res Ns Op Cm ize
 .Op Cm + Ns | Ns Cm - Ns
 .Ar size
 .Xc
 .Nm vi
 mode only.
 Grow or shrink the current screen.
 .Pp
 .It Xo
 .Cm rew Ns Op Cm ind Ns
 .Op Cm !\&
 .Xc
 Rewind the argument list.
 .Pp
 .It Xo
 .Cm se Ns Op Cm t
 .Sm off
 .Op option Oo = Oo value Oc Oc \ \&...
 .Sm on
 .Pf \ \& Op nooption ...
 .Op option? ...
 .Op Ar all
 .Xc
 Display or set editor options.
 .Pp
 .It Cm sh Ns Op Cm ell
 Run a shell program.
 .Pp
 .It Xo
 .Cm so Ns Op Cm urce
 .Ar file
 .Xc
 Read and execute
 .Nm ex
 commands from a file.
 .Pp
 .It Xo
 .Op Ar range
 .Cm s Ns Op Cm ubstitute
 .Sm off
 .Op / Ar pattern No / Ar replace No /
 .Sm on
 .Pf \ \& Op Ar options
 .Op Ar count
 .Op Ar flags
 .Xc
 .It Xo
 .Op Ar range
 .Cm &
 .Op Ar options
 .Op Ar count
 .Op Ar flags
 .Xc
 .It Xo
 .Op Ar range
 .Cm \(ti
 .Op Ar options
 .Op Ar count
 .Op Ar flags
 .Xc
 Make substitutions.
 The
 .Ar replace
 field may contain any of the following sequences:
 .Bl -tag -width Ds
 .It Sq \*(Am
 The text matched by
 .Ar pattern .
 .It Sq \(ti
 The replacement part of the previous
 .Cm substitute
 command.
 .It Sq %
 If this is the entire
 .Ar replace
 pattern, the replacement part of the previous
 .Cm substitute
 command.
 .It Sq \e Ns Ar \(sh
 Where
 .Sq Ar \(sh
 is an integer from 1 to 9, the text matched by the
 .Ar # Ns 'th subexpression in
 .Ar pattern .
 .It Sq \eL
 Causes the characters up to the end of the line of the next occurrence of
 .Sq \eE
 or
 .Sq \ee
 to be converted to lowercase.
 .It Sq \el
 Causes the next character to be converted to lowercase.
 .It Sq \eU
 Causes the characters up to the end of the line of the next occurrence of
 .Sq \eE
 or
 .Sq \ee
 to be converted to uppercase.
 .It Sq \eu
 Causes the next character to be converted to uppercase.
 .El
 .Pp
 .It Xo
 .Cm su Ns Op Cm spend Ns
 .Op Cm !\&
 .Xc
 .It Xo
 .Cm st Ns Op Cm op Ns
 .Op Cm !\&
 .Xc
 .It Aq Cm suspend
 Suspend the edit session.
 The
 .Aq suspend
 character is usually
 .Aq control-Z .
 .Pp
 .It Xo
 .Op Cm Tt Ns
 .Cm a Ns Op Cm g Ns
 .Op Cm !\&
 .Ar tagstring
 .Xc
 Edit the file containing the specified tag.
 .Pp
 .It Xo
 .Cm tagn Ns Op Cm ext Ns
 .Op Cm !\&
 .Xc
 Edit the file containing the next context for the current tag.
 .Pp
 .It Xo
 .Cm tagp Ns Op Cm op Ns
 .Op Cm !\&
 .Op Ar file | number
 .Xc
 Pop to the specified tag in the tags stack.
 .Pp
 .It Xo
 .Cm tagpr Ns Op Cm ev Ns
 .Op Cm !\&
 .Xc
 Edit the file containing the previous context for the current tag.
 .Pp
 .It Xo
 .Cm tagt Ns Op Cm op Ns
 .Op Cm !\&
 .Xc
 Pop to the least recent tag on the tags stack, clearing the stack.
 .Pp
 .It Xo
 .Cm una Ns Op Cm bbreviate
 .Ar lhs
 .Xc
 .Nm vi
 only.
 Delete an abbreviation.
 .Pp
 .It Cm u Ns Op Cm ndo
 Undo the last change made to the file.
 .Pp
 .It Xo
 .Cm unm Ns Op Cm ap Ns
 .Op Cm !\&
 .Ar lhs
 .Xc
 Unmap a mapped string.
 .Pp
 .It Cm ve Ns Op Cm rsion
 Display the version of the
 .Nm ex Ns / Ns Nm vi
 editor.
 .Pp
 .It Xo
 .Op Ar line
 .Cm vi Ns Op Cm sual
 .Op Ar type
 .Op Ar count
 .Op Ar flags
 .Xc
 .Nm ex
 mode only.
 Enter
 .Nm vi .
 .Pp
 .It Xo
 .Op Cm Vi Ns
 .Cm i Ns Op Cm sual Ns
 .Op Cm !\&
 .Op Ar +cmd
 .Op Ar file
 .Xc
 .Nm vi
 mode only.
 Edit a new file.
 .Pp
 .It Xo
 .Cm viu Ns Op Cm sage
 .Op Ar command
 .Xc
 Display usage for a
 .Nm vi
 command.
 .Pp
 .It Xo
 .Op Ar range
 .Cm w Ns Op Cm rite Ns
 .Op Cm !\&
 .Op >>
 .Op Ar file
 .Xc
 .It Xo
 .Op Ar range
 .Cm w Ns Op Cm rite
 .Op Cm !\&
 .Op Ar file
 .Xc
 .It Xo
 .Op Ar range
 .Cm wn Ns Op Cm !\&
 .Op >>
 .Op Ar file
 .Xc
 .It Xo
 .Op Ar range
 .Cm wq Ns Op Cm !\&
 .Op >>
 .Op Ar file
 .Xc
 Write the file.
 .Pp
 .It Xo
 .Op Ar range
 .Cm x Ns Op Cm it Ns
 .Op Cm !\&
 .Op Ar file
 .Xc
 Exit the editor,
 writing the file if it has been modified.
 .Pp
 .It Xo
 .Op Ar range
 .Cm ya Ns Op Cm nk
 .Op Ar buffer
 .Op Ar count
 .Xc
 Copy the specified lines to a buffer.
 .Pp
 .It Xo
 .Op Ar line
 .Cm z
 .Op Ar type
 .Op Ar count
 .Op Ar flags
 .Xc
 Adjust the window.
 .El
 .Sh SET OPTIONS
 There are a large number of options that may be set
 .Pq or unset
 to change the editor's behavior.
 This section describes the options, their abbreviations and their
 default values.
 .Pp
 In each entry below, the first part of the tag line is the full name
 of the option, followed by any equivalent abbreviations.
 The part in square brackets is the default value of the option.
 Most of the options are boolean, i.e., they are either on or off,
 and do not have an associated value.
 .Pp
 Options apply to both
 .Nm ex
 and
 .Nm vi
 modes, unless otherwise specified.
 .Bl -tag -width Ds
 .It Cm altwerase Bq off
 .Nm vi
 only.
 Select an alternate word erase algorithm.
 .It Cm autoindent , ai Bq off
 Automatically indent new lines.
 .It Cm autoprint , ap Bq on
 .Nm ex
 only.
 Display the current line automatically.
 .It Cm autowrite , aw Bq off
 Write modified files automatically when changing files or suspending the editor
 session.
 .It Cm backup Bq \&"\&"
 Back up files before they are overwritten.
 .It Cm beautify , bf Bq off
 Discard control characters.
 .It Cm cdpath Bo environment variable Ev CDPATH , or current directory Bc
 The directory paths used as path prefixes for the
 .Cm cd
 command.
 .It Cm cedit Bq no default
 Set the character to edit the colon command-line history.
 .It Cm columns , co Bq 80
 Set the number of columns in the screen.
 .It Cm comment Bq off
 .Nm vi
 only.
 Skip leading comments in shell, C and C++ language files.
 .It Cm directory , dir Bo environment variable Ev TMPDIR , or Pa /tmp Bc
 The directory where temporary files are created.
 .It Cm edcompatible , ed Bq off
 Remember the values of the
 .Sq c
 and
 .Sq g
 suffixes to the
 .Cm substitute
 commands, instead of initializing them as unset for each new command.
 .It Cm errorbells , eb Bq off
 .Nm ex
 only.
 Announce error messages with a bell.
 .It Cm escapetime Bq 1
 The tenths of a second
 .Nm ex Ns / Ns Nm vi
 waits for a subsequent key to complete an
 .Aq escape
 key mapping.
 .It Cm expandtab , et Bq off
 Expand
 .Aq tab
 characters to
 .Aq space
 when inserting, replacing or shifting text, autoindenting,
 indenting with
 .Aq Ic control-T ,
 outdenting with
 .Aq Ic control-D ,
 or
 when filtering lines with the
 .Cm !\&
 command.
 .It Cm exrc , ex Bq off
 Read the startup files in the local directory.
 .It Cm extended Bq off
 Use extended regular expressions
 .Pq EREs
 rather than basic regular expressions
 .Pq BREs .
 See
 .Xr re_format 7
 for more information on regular expressions.
 .It Cm filec Bq Aq tab
 Set the character to perform file path completion on the colon command line.
 .It Cm fileencoding , fe Bq auto detect
 Set the encoding of the current file.
 .It Cm flash Bq on
 Flash the screen instead of beeping the keyboard on error.
 .It Cm hardtabs, ht Bq 0
 Set the spacing between hardware tab settings.
 This option currently has no effect.
 .It Cm iclower Bq off
 Makes all regular expressions case-insensitive,
 as long as an upper-case letter does not appear in the search string.
 .It Cm ignorecase , ic Bq off
 Ignore case differences in regular expressions.
 .It Cm inputencoding , ie Bq locale
 Set the encoding of your input characters.
 .It Cm keytime Bq 6
 The tenths of a second
 .Nm ex Ns / Ns Nm vi
 waits for a subsequent key to complete a key mapping.
 .It Cm leftright Bq off
 .Nm vi
 only.
 Do left-right scrolling.
 .It Cm lines , li Bq 24
 .Nm vi
 only.
 Set the number of lines in the screen.
 .It Cm lisp Bq off
 .Nm vi
 only.
 Modify various search commands and options to work with Lisp.
 This option is not yet implemented.
 .It Cm list Bq off
 Display lines in an unambiguous fashion.
 .It Cm lock Bq on
 Attempt to get an exclusive lock on any file being edited, read or written.
 .It Cm magic Bq on
 When turned off, all regular expression characters except for
 .Sq \(ha
 and
 .Sq \(Do
 are treated as ordinary characters.
 Preceding individual characters by
 .Sq \e
 re-enables them.
 .It Cm matchchars Bq []{}()
 Character pairs looked for by the
 .Cm %
 command.
 .It Cm matchtime Bq 7
 .Nm vi
 only.
 The tenths of a second
 .Nm ex Ns / Ns Nm vi
 pauses on the matching character when the
 .Cm showmatch
 option is set.
 .It Cm mesg Bq on
 Permit messages from other users.
 .It Cm msgcat Bq /usr/share/vi/catalog/
 Selects a message catalog to be used to display error and informational
 messages in a specified language.
 .It Cm modelines , modeline Bq off
 Read the first and last few lines of each file for
 .Nm ex
 commands.
 This option will never be implemented.
 .It Cm noprint Bq \&"\&"
 Characters that are never handled as printable characters.
 .It Cm number , nu Bq off
 Precede each line displayed with its current line number.
 .It Cm octal Bq off
 Display unknown characters as octal numbers, instead of the default
 hexadecimal.
 .It Cm open Bq on
 .Nm ex
 only.
 If this option is not set, the
 .Cm open
 and
 .Cm visual
 commands are disallowed.
 .It Cm optimize , opt Bq on
 .Nm vi
 only.
 Optimize text throughput to dumb terminals.
 This option is not yet implemented.
 .It Cm paragraphs , para Bq "IPLPPPQPP LIpplpipbp"
 .Nm vi
 only.
 Define additional paragraph boundaries for the
 .Cm {\&
 and
 .Cm }\&
 commands.
 .It Cm path Bq \&"\&"
 Define additional directories to search for files being edited.
 .It Cm print Bq \&"\&"
 Characters that are always handled as printable characters.
 .It Cm prompt Bq on
 .Nm ex
 only.
 Display a command prompt.
 .It Cm readonly , ro Bq off
 Mark the file and session as read-only.
 .It Cm recdir Bq /var/tmp/vi.recover
 The directory where recovery files are stored.
 .It Cm redraw , re Bq off
 .Nm vi
 only.
 Simulate an intelligent terminal on a dumb one.
 This option is not yet implemented.
 .It Cm remap Bq on
 Remap keys until resolved.
 .It Cm report Bq 5
 Set the number of lines about which the editor reports changes or yanks.
 .It Cm ruler Bq off
 .Nm vi
 only.
 Display a row/column ruler on the colon command line.
 .It Cm scroll , scr Bq "window size / 2"
 Set the number of lines scrolled.
 .It Cm searchincr Bq off
 Makes the
 .Cm /
 and
 .Cm ?\&
 commands incremental.
 .It Cm sections , sect Bq "NHSHH HUnhsh"
 .Nm vi
 only.
 Define additional section boundaries for the
 .Cm [[
 and
 .Cm ]]
 commands.
 .It Cm secure Bq off
 Turns off all access to external programs.
 .It Cm shell , sh Bo environment variable Ev SHELL , or Pa /bin/sh Bc
 Select the shell used by the editor.
 .It Cm shellmeta Bq \(ti{[*?$\`\(aq\&"\e
 Set the meta characters checked to determine if file name expansion
 is necessary.
 .It Cm shiftwidth , sw Bq 8
 Set the autoindent and shift command indentation width.
 .It Cm showmatch , sm Bq off
 .Nm vi
 only.
 Note the left matching characters when the right ones are inserted.
 .It Cm showmode , smd Bq off
 .Nm vi
 only.
 Display the current editor mode and a
 .Dq modified
 flag.
 .It Cm sidescroll Bq 16
 .Nm vi
 only.
 Set the amount a left-right scroll will shift.
 .It Cm slowopen , slow Bq off
 Delay display updating during text input.
 This option is not yet implemented.
 .It Cm sourceany Bq off
 Read startup files not owned by the current user.
 This option will never be implemented.
 .It Cm tabstop , ts Bq 8
 This option sets tab widths for the editor display.
 .It Cm taglength , tl Bq 0
 Set the number of significant characters in tag names.
 .It Cm tags , tag Bq tags
 Set the list of tags files.
 .It Xo
 .Cm term , ttytype , tty
 .Bq environment variable Ev TERM
 .Xc
 Set the terminal type.
 .It Cm terse Bq off
 This option has historically made editor messages less verbose.
 It has no effect in this implementation.
 .It Cm tildeop Bq off
 Modify the
 .Cm \(ti
 command to take an associated motion.
 .It Cm timeout , to Bq on
 Time out on keys which may be mapped.
 .It Cm ttywerase Bq off
 .Nm vi
 only.
 Select an alternate erase algorithm.
 .It Cm verbose Bq off
 .Nm vi
 only.
 Display an error message for every error.
 .It Cm w300 Bq no default
 .Nm vi
 only.
 Set the window size if the baud rate is less than 1200 baud.
 .It Cm w1200 Bq no default
 .Nm vi
 only.
 Set the window size if the baud rate is equal to 1200 baud.
 .It Cm w9600 Bq no default
 .Nm vi
 only.
 Set the window size if the baud rate is greater than 1200 baud.
 .It Cm warn Bq on
 .Nm ex
 only.
 This option causes a warning message to be printed on the terminal
 if the file has been modified since it was last written, before a
 .Cm !\&
 command.
 .It Xo
 .Cm window , w , wi
 .Bq environment variable Ev LINES No \(mi 1
 .Xc
 Set the window size for the screen.
 .It Cm windowname Bq off
 Change the icon/window name to the current file name.
 .It Cm wraplen , wl Bq 0
 .Nm vi
 only.
 Break lines automatically,
 the specified number of columns from the left-hand margin.
 If both the
 .Cm wraplen
 and
 .Cm wrapmargin
 edit options are set, the
 .Cm wrapmargin
 value is used.
 .It Cm wrapmargin , wm Bq 0
 .Nm vi
 only.
 Break lines automatically,
 the specified number of columns from the right-hand margin.
 If both the
 .Cm wraplen
 and
 .Cm wrapmargin
 edit options are set, the
 .Cm wrapmargin
 value is used.
 .It Cm wrapscan , ws Bq on
 Set searches to wrap around the end or beginning of the file.
 .It Cm writeany , wa Bq off
 Turn off file-overwriting checks.
 .El
 .Sh ENVIRONMENT
 .Bl -tag -width "COLUMNS"
 .It Ev COLUMNS
 The number of columns on the screen.
 This value overrides any system or terminal specific values.
 If the
 .Ev COLUMNS
 environment variable is not set when
 .Nm ex Ns / Ns Nm vi
 runs, or the
 .Cm columns
 option is explicitly reset by the user,
 .Nm ex Ns / Ns Nm vi
 enters the value into the environment.
 .It Ev EXINIT
 A list of
 .Nm ex
 startup commands, read after
 .Pa /etc/vi.exrc
 unless the variable
 .Ev NEXINIT
 is also set.
 .It Ev HOME
 The user's home directory, used as the initial directory path for the startup
 .Pa $HOME/.nexrc
 and
 .Pa $HOME/.exrc
 files.
 This value is also used as the default directory for the
 .Cm cd
 command.
 .It Ev LINES
 The number of rows on the screen.
 This value overrides any system or terminal specific values.
 If the
 .Ev LINES
 environment variable is not set when
 .Nm ex Ns / Ns Nm vi
 runs, or the
 .Cm lines
 option is explicitly reset by the user,
 .Nm ex Ns / Ns Nm vi
 enters the value into the environment.
 .It Ev NEXINIT
 A list of
 .Nm ex
 startup commands, read after
 .Pa /etc/vi.exrc .
 .It Ev SHELL
 The user's shell of choice
 .Pq see also the Cm shell No option .
 .It Ev TERM
 The user's terminal type.
 The default is the type
 .Dq unknown .
 If the
 .Ev TERM
 environment variable is not set when
 .Nm ex Ns / Ns Nm vi
 runs, or the
 .Cm term
 option is explicitly reset by the user,
 .Nm ex Ns / Ns Nm vi
 enters the value into the environment.
 .It Ev TMPDIR
 The location used to store temporary files
 .Pq see also the Cm directory No edit option .
 .El
 .Sh ASYNCHRONOUS EVENTS
 .Bl -tag -width "SIGWINCH" -compact
 .It Dv SIGALRM
 .Nm vi Ns / Ns Nm ex
 uses this signal for periodic backups of file modifications and to display
 .Dq busy
 messages when operations are likely to take a long time.
 .Pp
 .It Dv SIGHUP
 .It Dv SIGTERM
 If the current buffer has changed since it was last written in its entirety,
 the editor attempts to save the modified file so it can be later recovered.
 See the
 .Nm vi Ns / Ns Nm ex
 reference manual section
 .Sx Recovery
 for more information.
 .Pp
 .It Dv SIGINT
 When an interrupt occurs, the current operation is halted
 and the editor returns to the command level.
 If interrupted during text input,
 the text already input is resolved into the file as if the text
 input had been normally terminated.
 .Pp
 .It Dv SIGWINCH
 The screen is resized.
 See the
 .Nm vi Ns / Ns Nm ex
 reference manual section
 .Sx Sizing the Screen
 for more information.
 .\" .Pp
 .\" .It Dv SIGCONT
 .\" .It Dv SIGTSTP
 .\" .Nm vi Ns / Ns Nm ex
 .\" ignores these signals.
 .El
 .Sh FILES
 .Bl -tag -width "/var/tmp/vi.recover"
 .It Pa /bin/sh
 The default user shell.
 .It Pa /etc/vi.exrc
 System-wide
 .Nm vi
 startup file.
 It is read for
 .Nm ex
 commands first in the startup sequence.
 Must be owned by root or the user,
 and writable only by the owner.
 .It Pa /tmp
 Temporary file directory.
 .It Pa /var/tmp/vi.recover
 The default recovery file directory.
 .It Pa $HOME/.nexrc
 First choice for user's home directory startup file, read for
 .Nm ex
 commands right after
 .Pa /etc/vi.exrc
 unless either
 .Ev NEXINIT
 or
 .Ev EXINIT
 are set.
 Must be owned by root or the user,
 and writable only by the owner.
 .It Pa $HOME/.exrc
 Second choice for user's home directory startup file, read for
 .Nm ex
 commands under the same conditions as
 .Pa $HOME/.nexrc .
 .It Pa .nexrc
 First choice for local directory startup file, read for
 .Nm ex
 commands at the end of the startup sequence if the
 .Cm exrc
 option was turned on earlier.
 Must be owned by the user
 and writable only by the owner.
 .It Pa .exrc
 Second choice for local directory startup file, read for
 .Nm ex
 commands under the same conditions as
 .Pa .nexrc .
 .El
 .Sh EXIT STATUS
 The
 .Nm ex
 and
 .Nm vi
 utilities exit 0 on success,
 and \*(Gt0 if an error occurs.
 .Sh SEE ALSO
 .Xr ctags 1 ,
 .Xr iconv 1 ,
 .Xr re_format 7
+.Rs
+.%T vi/ex reference manual
+.%U https://docs.freebsd.org/44doc/usd/13.viref/paper.pdf
+.Re
 .Sh STANDARDS
 .Nm nex Ns / Ns Nm nvi
 is close to
 .St -p1003.1-2008 .
 That document differs from historical
 .Nm ex Ns / Ns Nm vi
 practice in several places; there are changes to be made on both sides.
 .Sh HISTORY
 The
 .Nm ex
 editor first appeared in
 .Bx 1 .
 The
 .Nm nex Ns / Ns Nm nvi
 replacements for the
 .Nm ex Ns / Ns Nm vi
 editor first appeared in
 .Bx 4.4 .
 .Sh AUTHORS
 .An Bill Joy
 wrote the original version of
 .Nm ex
 in 1977.