.\" Copyright (c) 1994
.\"     The Regents of the University of California.  All rights reserved.
.\"
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.\" modification, are permitted provided that the following conditions
.\" are met:
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.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\"    must display the following acknowledgement:
.\"	This product includes software developed by the University of
.\"	California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\"    may be used to endorse or promote products derived from this software
.\"    without specific prior written permission.
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\"
.\"     @(#)set.opt.roff	8.5 (Berkeley) 3/22/94
.\"
There are a large number of options that may be set (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.
#ifdef REFERENCE
(Regardless of the abbreviations, it is only necessary to use the
minimum number of characters necessary to distinguish an abbreviation
from all other commands for it to be accepted, in
.Nm nex/nvi .
Historically, only the full name and the official abbreviations
were accepted by
.Nm ex/vi .
Using full names in your startup files and environmental variables will
probably make them more portable.)
#endif
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.
#ifdef REFERENCE
.Pp
For information on modifying the options or to display the options and
their current values, see the
.Dq set
command in the Ex Commands section.
#endif
.Bl -tag -width "XXXX" -compact
.It Li "altwerase [off]"
.Nm \&Vi
only.
#ifdef MANUAL
Select an alternate word erase algorithm.
#endif
#ifdef REFERENCE
Change how
.Nm \&vi
does word erase during text input.
When this option is set, text is broken up into three classes:
alphabetic, numeric and underscore characters, other non-blank
characters, and blank characters.
Changing from one class to another marks the end of a word.
In addition, the class of the first character erased is ignored
(which is exactly what you want when erasing pathname components).
#endif
.It Li "autoindent, ai [off]"
#ifdef MANUAL
Automatically indent new lines.
#endif
#ifdef REFERENCE
If this option is set, whenever you create a new line (using the
.Nm \&vi
.Sy \&A ,
.Sy \&a ,
.Sy \&C ,
.Sy \&c ,
.Sy \&I ,
.Sy \&i ,
.Sy \&O ,
.Sy \&o ,
.Sy \&R ,
.Sy \&r ,
.Sy \&S ,
and
.Sy \&s
commands, or the
.Nm \&ex
.Sy append ,
.Sy change ,
and
.Sy insert
commands) the new line is automatically indented to align the cursor with
the first non-blank character of the line from which you created it.
Lines are indented using tab characters to the extent possible (based on
the value of the
.Sy tabstop
option) and then using space characters as necessary.
For commands inserting text into the middle of a line, any blank characters
to the right of the cursor are discarded, and the first non-blank character
to the right of the cursor is aligned as described above.
.Pp
The indent characters are themselves somewhat special.
If you do not enter more characters on the new line before moving moving to
another line, or entering <escape>, the indent character will be deleted and
the line will be empty.
For example, if you enter <carriage-return> twice in succession, the line
created by the first <carriage-return> will not have any characters in it,
regardless of the indentation of the previous or subsequent line.
.Pp
Indent characters also require that you enter additional erase characters
to delete them.
For example, if you have an indented line, containing only blanks, the first
<word-erase> character you enter will erase up to end of the indent characters,
and the second will erase back to the beginning of the line.
(Historically, only the
.Sy \&^D
key would erase the indent characters.
Both the
.Sy \&^D
key and the usual erase keys work in
.Nm nvi .)
In addition, if the cursor is positioned at the end of the indent
characters, the keys
.Dq 0^D
will erase all of the indent characters for the current line,
resetting the indentation level to 0.
Similarly, the keys
.Dq ^^D
(i.e. a carat followed by a <control-D>) will erase all of the indent
characters for the current line, leaving the indentation level for
future created lines unaffected.
.Pp
Finally, if
.Sy autoindent
is set, the
.Sy \&S
and
.Sy \&cc
commands change from the first non-blank of the line to the end of the
line, instead of from the beginning of the line to the end of the line.
#endif
.It Li "autoprint, ap [off]"
.Nm \&Ex
only.
#ifdef MANUAL
Display the current line automatically.
.
#endif
#ifdef REFERENCE
.Nm \&Ex
only.
Cause the current line to be automatically displayed after the
.Nm \&ex
commands
.Sy \&< ,
.Sy \&> ,
.Sy copy ,
.Sy delete ,
.Sy join ,
.Sy move ,
.Sy put ,
.Sy \&t ,
.Sy Undo ,
and
.Sy undo .
This automatic display is suppressed during
.Sy global
and
.Sy vglobal
commands, and for any command where optional flags are used to explicitly
display the line.
#endif
.It Li "autowrite, aw [off]"
#ifdef MANUAL
Write modified files automatically when changing files.
#endif
#ifdef REFERENCE
If this option is set, the
.Nm \&vi
.Sy \&!
.Sy \&^^
.Sy \&^]
and
.Sy \&^Z
commands, and the
.Nm \&ex
.Sy edit ,
.Sy next ,
.Sy rewind ,
.Sy stop ,
.Sy suspend ,
.Sy tag ,
.Sy tagpop ,
and
.Sy tagtop
commands automatically write the current file back to the current file name
if it has been modified since it was last written.
If the write fails, the command fails and goes no further.
.Pp
Appending the optional force flag
.Dq \&!
to the
.Nm \&ex
commands
.Sy next ,
.Sy rewind ,
.Sy stop ,
.Sy suspend ,
.Sy tag ,
.Sy tagpop ,
and
.Sy tagtop
stops the automatic write from being attempted.
.Pp
(Historically, the
.Sy next
command ignored the optional force flag.)
Note, the
.Nm \&ex
commands
.Sy edit ,
.Sy quit ,
.Sy shell ,
and
.Sy xit
are
.Em not
affected by the
.Sy autowrite
option.
#endif
.It Li "beautify, bf [off]"
#ifdef MANUAL
Discard control characters.
#endif
#ifdef REFERENCE
If this option is set, all control characters that are not currently being
specially interpreted, other than <tab>, <newline>, and <form-feed>, are
discarded from commands read in by
.Nm \&ex
from command files, and from input text entered to
.Nm \&vi
(either into the file or to the colon command line).
Text files read by
.Nm ex/vi
are
.Em not
affected by the
.Sy beautify
option.
#endif
.It Li "cdpath [environment variable CDPATH, or ``.'']"
#ifdef MANUAL
The directory paths used as path prefixes for the
.Sy cd
command.
#endif
#ifdef REFERENCE
This option is used to specify a colon separated list of directories
which are used as path prefixes for any relative path names used as
arguments for the
.Sy cd
command.
The value of this option defaults to the value of the environmental
variable
.Ev CDPATH
if it is set, otherwise to the current directory.
For compatibility with the POSIX 1003.2 shell, the
.Sy cd
command does
.Em not
check the current directory as a path prefix for relative path names
unless it is explicitly specified.
It may be so specified by entering an empty string or a
.Dq \&.
into the
.Ev CDPATH 
variable or the option value.
#endif
.It Li "columns, co [80]"
#ifdef MANUAL
Set the number of columns in the screen.
#endif
#ifdef REFERENCE
The number of columns in the screen.
Setting this option causes
.Nm ex/vi
to set (or reset) the environmental variable
.Ev COLUMNS .
See the SCREEN SIZING section for more information.
#endif
.It Li "comment [off]"
.Nm \&Vi
only.
#ifdef MANUAL
Skip leading comments in files.
#endif
#ifdef REFERENCE
If the first non-empty line of the file begins with the string
.Dq \&/\&* ,
this option causes
.Nm \&vi
to skip to the end of that C comment (probably a terribly boring
legal notice) before displaying the file.
#endif
.It Li "directory, dir [environment variable TMPDIR, or /tmp]"
#ifdef MANUAL
The directory where temporary files are created.
#endif
#ifdef REFERENCE
The directory where temporary files are created.
The environmental variable
.Ev TMPDIR
is used as the default value if it exists, otherwise
.Pa /tmp
is used.
#endif
.It Li "edcompatible, ed [off]"
#ifdef MANUAL
Modify the behavior of certain suffices for the
.Nm ex
.Sy substitute
command.
#endif
#ifdef REFERENCE
This option causes the presence or absence of
.Sy \&g
and
.Sy \&c
suffixes on
.Sy substitute
commands to be remembered,
and to be toggled by repeating the suffices.
The suffix
.Sy \&r
makes the substitution be as in the
.Sy \&~
command, instead of like the
.Sy \&&
command.
#endif
.br
.Em "This option is not yet implemented."
.It Li "errorbells, eb [off]"
.Nm \&Ex
only.
#ifdef MANUAL
Precede error messages with a bell.
#endif
#ifdef REFERENCE
Causes
.Nm \&ex
error messages to be preceded by a bell.
#endif
.br
.Em "This option is not yet implemented."
.It Li "exrc, ex [off]"
#ifdef MANUAL
Never read startup files in the local directory.
#endif
#ifdef REFERENCE
If this option is turned off in the system or $HOME startup files,
the local startup files are never read (unless they are the same
as the system or $HOME startup files).
Turning it on has no effect, i.e. the normal checks for local startup
files are performed, regardless.
See the STARTUP INFORMATION section for more information.
#endif
.It Li "extended [off]"
#ifdef MANUAL
Regular expressions are extended (i.e.
.Xr egrep 1
style) expressions.
#endif
#ifdef REFERENCE
This option causes all regular expressions to be treated as POSIX
1003.2 extended regular expressions (which are similar to historic
.Xr egrep 1
style expressions).
#endif
.It Li "flash [on]"
#ifdef MANUAL
Flash the screen instead of beeping the keyboard on error.
#endif
#ifdef REFERENCE
This option causes the screen to flash instead of beeping the keyboard,
on error, if the terminal has the capability.
#endif
.It Li "hardtabs, ht [8]"
#ifdef MANUAL
Set the spacing between hardware tab settings.
#endif
#ifdef REFERENCE
This option defines the spacing between hardware tab settings, i.e.
the tab expansion done by the operating system and/or the terminal
itself.
As
.Nm nex/nvi
never writes tabs to the terminal, unlike historic versions of
.Nm ex/vi ,
this option does not currently have any affect.
#endif
.It Li "ignorecase, ic [off]"
#ifdef MANUAL
Ignore case differences in regular expressions.
#endif
#ifdef REFERENCE
This option causes regular expressions, both in
.Nm \&ex
commands and in searches,
to be evaluated in a case-insensitive manner.
#endif
.It Li "keytime [6]"
The 10th's of a second
.Nm ex/vi
waits for a subsequent key to complete a key mapping.
.It Li "leftright [off]"
.Nm \&Vi
only.
#ifdef MANUAL
Do left-right scrolling.
#endif
#ifdef REFERENCE
This option causes the screen to be scrolled left-right to view
lines longer than the screen, instead of the traditional
.Nm \&vi
screen interface which folds long lines at the right-hand margin
of the terminal.
#endif
.It Li "lines, li [24]"
.Nm \&Vi
only.
#ifdef MANUAL
Set the number of lines in the screen.
#endif
#ifdef REFERENCE
The number of lines in the screen.
Setting this option causes
.Nm ex/vi
to set (or reset) the environmental variable
.Ev LINES .
See the Screen Sizing section for more information.
#endif
.It Li "lisp [off]"
.Nm \&Vi
only.
#ifdef MANUAL
Modify various search commands and options to work with Lisp.
#endif
#ifdef REFERENCE
This option changes the behavior of the
.Nm \&vi
.Sy \&( ,
.Sy \&) ,
.Sy \&{ ,
.Sy \&} ,
.Sy \&[[
and
.Sy \&]]
commands to match the Lisp language.
Also, the
.Sy autoindent
option's behavior is changed to be appropriate for Lisp.
#endif
.br
.Em "This option is not yet implemented."
.It Li "list [off]"
#ifdef MANUAL
Display lines in an unambiguous fashion.
#endif
#ifdef REFERENCE
This option causes lines to be displayed in an unambiguous fashion.
Specifically, tabs are displayed as control characters, i.e.
.Dq \&^I ,
and the ends of lines are marked with a
.Dq \&$
character.
#endif
.It Li "magic [on]"
#ifdef MANUAL
Treat certain characters specially in regular expressions.
#endif
#ifdef REFERENCE
This option is on by default.
Turning the
.Sy magic
option off causes all regular expression characters except for
.Dq \&^
and
.Dq \&$ ,
to be treated as ordinary characters.
To re-enable characters individually, when the
.Sy magic
option is off,
precede them with an
.Dq \&\e .
See the REGULAR EXPRESSIONS AND REPLACEMENT STRINGS section for
more information.
#endif
.It Li "matchtime [7]"
.Nm \&Vi
only.
The 10th's of a second
.Nm ex/vi
pauses on the matching character when the
.Sy showmatch
option is set.
.It Li "mesg [on]"
#ifdef MANUAL
Permit messages from other users.
#endif
#ifdef REFERENCE
This option allows other users to contact you using the
.Xr talk 1
and
.Xr write 1
utilities, while you are editing.
.Nm Ex/vi
does not turn message on, i.e. if messages were turned off when the
editor was invoked, they will stay turned off.
This option only permits you to disallow messages for the edit session.
See the
.Xr mesg 1
utility for more information.
#endif
.It Li "modelines, modeline [off]"
#ifdef MANUAL
Read the first and last few lines of each file for
.Nm ex
commands.
#endif
#ifdef REFERENCE
If the
.Sy modelines
option is set,
.Nm ex/vi
has historically scanned the first and last five lines of each file as
it is read for editing, looking for any
.Nm \&ex
commands that have been placed in those lines.
After the startup information has been processed, and before the user
starts editing the file, any commands embedded in the file are executed.
Commands are recognized by the letters
.Dq \&e
or
.Dq \&v
followed by
.Dq \&x
or
.Dq \&i ,
at the beginning of a line or following a tab or space character,
and followed by a
.Dq \&: ,
an
.Nm \&ex
command, and another
.Dq \&: .
This option is a security problem of immense proportions,
and should not be used under any circumstances.
#endif
.br
.Em "This option will never be implemented."
.It Li "number, nu [off]"
Precede each line displayed with its current line number.
.It Li "open [on]"
.Nm \&Ex
only.
If this option is not set, the
.Sy open
and
.Sy visual
commands are disallowed.
.It Li "optimize, opt [on]"
.Nm \&Vi
only.
#ifdef MANUAL
Optimize text throughput to dumb terminals.
#endif
#ifdef REFERENCE
Throughput of text is expedited by setting the terminal to no do automatic
carriage returns when printing more than one (logical) line of output,
greatly speeding output on terminals without addressable cursors when text
with leading white space is printed.
#endif
.br
.Em "This option is not yet implemented."
.It Li "paragraphs, para [IPLPPPQPP LIpplpipbp]"
.Nm \&Vi
only.
Define additional paragraph boundaries for the
.Sy \&{
and
.Sy \&}
commands.
#ifdef REFERENCE
The value of this option must be a character string consisting
of zero or more character pairs.
.Pp
In the text to be edited, the character string <newline>.<char-pair>,
(where <char-pair> is one of the character pairs in the option's value)
defines a paragraph boundary.
For example, if the option were set to
.Dq "LaA ##" ,
then all of the following additional paragraph boundaries would be
recognized:
.Bd -literal -offset indent -compact
<newline>.La
<newline>.A<space>
<newline>.##
.Ed
#endif
.It Li "prompt [on]"
.Nm \&Ex
only.
#ifdef MANUAL
Display a command prompt.
#endif
#ifdef REFERENCE
This option causes
.Nm \&ex
to prompt for command input with a
.Dq \&:
character; when it's not set, no prompt is displayed.
#endif
.It Li "readonly, ro [off]"
#ifdef MANUAL
Mark the file as read-only.
#endif
#ifdef REFERENCE
This option causes a force flag to be required to attempt to write
the file back to the original file name.
Setting this option is equivalent to using the
.Fl R
command line option, or editing a file which lacks write permission.
#endif
.It Li "recdir [/var/tmp/vi.recover]"
The directory where recovery files are stored.
.It Li "redraw, re [off]"
.Nm \&Vi
only.
#ifdef MANUAL
Simulate an intelligent terminal on a dumb one.
#endif
#ifdef REFERENCE
The editor simulates (using great amounts of output), an intelligent
terminal on a dumb terminal (e.g. during insertions in visual mode
the characters to the right of the cursor are refreshed as each input
character is typed).
#endif
.br
.Em "This option is not yet implemented."
.It Li "remap [on]"
#ifdef MANUAL
Remap keys until resolved.
#endif
#ifdef REFERENCE
If this option is set,
it's possible to define macros in terms of other macros.
Otherwise, each key is only remapped up to one time.
For example, if
.Dq \&A
is mapped to
.Dq \&B ,
and
.Dq \&B
is mapped to
.Dq \&C ,
The keystroke
.Dq \&A
will be mapped to
.Dq \&C
if
.Sy remap
is set, and to
.Dq \&B
if it is not set.
#endif
.It Li "remapmax [on]"
#ifdef MANUAL
Limit the number of times a key may be remapped.
#endif
#ifdef REFERENCE
If this option is set, a key may only be remapped 50 times.
If it is not set, a key may be remapped an infinite number of times,
and the editor can be placed into infinite loops.
#endif
.It Li "report [5]"
#ifdef MANUAL
Set the number of lines about which the editor reports changes.
#endif
#ifdef REFERENCE
Set the threshold of the number of lines that need to be changed
before a message will be displayed to the user.
The value is the largest value about which the editor is silent,
i.e. by default, 6 lines must change before the user is notified.
#endif
.It Li "ruler [off]"
.Nm \&Vi
only.
Display a row/column ruler on the colon command line.
.It Li "scroll, scr [window / 2]"
#ifdef MANUAL
Set the number of lines scrolled.
#endif
#ifdef REFERENCE
Set the number of lines scrolled by the
.Nm \&vi
commands
.Sy \&^D
and
.Sy \&^U .
.Pp
Historically, the
.Nm ex
.Sy z
command, when specified without a count, used two times the size of the
scroll value; the POSIX 1003.2 standard specified the window size, which
is a better choice.
#endif
.It Li "sections, sect [NHSHH HUnhsh]"
.Nm \&Vi
only.
Define additional section boundaries for the
.Sy \&[[
and
.Sy \&]]
commands.
#ifdef REFERENCE
The
.Sy sections
option should be set to a character string consisting of zero or
more character pairs.
In the text to be edited, the character string <newline>.<char-pair>,
(where <char-pair> is one of the character pairs in the option's value),
defines a section boundary in the same manner that
.Sy paragraph
option boundaries are defined.
#endif
.It Li "shell, sh [environment variable SHELL, or /bin/sh]"
Select the shell used by the editor.
#ifdef REFERENCE
The specified path is the pathname of the shell invoked by the
.Nm \&vi
.Sy \&!
shell escape command and by the
.Nm \&ex
.Sy shell
command.
This program is also used to resolve any shell meta-characters in
.Nm \&ex
commands.
#endif
.It Li "shiftwidth, sw [8]"
Set the autoindent and shift command indentation width.
#ifdef REFERENCE
This width is used by the
.Sy autoindent
option and by the
.Sy \&< ,
.Sy \&> ,
and
.Sy shift
commands.
#endif
.It Li "showdirty [off]"
.Nm \&Vi
only.
Display an asterisk on the colon command line if the file has been modified.
.It Li "showmatch, sm [off]"
.Nm \&Vi
only.
#ifdef MANUAL
Note matching
.Dq \&{
and
.Dq \&(
for
.Dq \&}
and
.Dq \&)
characters.
#endif
#ifdef REFERENCE
This option causes
.Nm \&vi ,
when a
.Dq \&}
or
.Dq \&)
is entered, to briefly move the cursor the matching
.Dq \&{
or
.Dq \&( .
See the
.Sy matchtime
option for more information.
#endif
.It Li "showmode [off]"
.Nm \&Vi
only.
#ifdef MANUAL
Display the current editor mode (command or input).
#endif
#ifdef REFERENCE
This option causes
.Nm \&vi
to display the strings
.Dq Command
or
.Dq Input
on the colon command line, based on the current mode of the editor.
#endif
.It Li "sidescroll [16]"
.Nm \&Vi
only.
#ifdef MANUAL
Set the amount a left-right scroll will shift.
#endif
#ifdef REFERENCE
Sets the number of columns that are shifted to the left or right,
when
.Nm \&vi
is doing left-right scrolling and the left or right margin is
crossed.
See the
.Sy leftright
option for more information.
#endif
.It Li "slowopen, slow [off]"
#ifdef MANUAL
Delay display updating during text input.
#endif
#ifdef REFERENCE
This option affects the display algorithm used by
.Nm \&vi ,
holding off display updating during input of new text to improve
throughput when the terminal in use is slow and unintelligent.
#endif
.br
.Em "This option is not yet implemented."
.It Li "sourceany [off]"
#ifdef MANUAL
Read startup files not owned by the current user.
#endif
#ifdef REFERENCE
If this option is turned on,
.Nm \&vi
historically read startup files that were owned by someone other than
the editor user.
See the STARTUP INFORMATION section for more information.
This option is a security problem of immense proportions,
and should not be used under any circumstances.
#endif
.br
.Em "This option will never be implemented."
.It Li "tabstop, ts [8]"
This option sets tab widths for the editor display.
.It Li "taglength, tl [0]"
#ifdef MANUAL
Set the number of significant characters in tag names.
#endif
#ifdef REFERENCE
This option sets the maximum number of characters that are considered
significant in a tag name.
Setting the value to 0 makes all of the characters in the tag name
significant.
#endif
.It Li "tags, tag [tags /var/db/libc.tags /sys/kern/tags]"
#ifdef MANUAL
Set the list of tags files.
#endif
#ifdef REFERENCE
Sets the list of tags files, in search order,
which are used when the editor searches for a tag.
#endif
.It Li "term, ttytype, tty [environment variable TERM]"
Set the terminal type.
#ifdef REFERENCE
Setting this option causes
.Nm ex/vi
to set (or reset) the environmental variable
.Ev TERM .
#endif
.It Li "terse [off]"
This option has historically made editor messages less verbose.
It has no effect in this implementation.
#ifdef REFERENCE
See the
.Sy verbose
option for more information.
#endif
.It Li "timeout, to [on]"
#ifdef MANUAL
Time out on keys which may be mapped.
#endif
#ifdef REFERENCE
If this option is set,
.Nm ex/vi
waits for a specific period for a subsequent key to complete a key
mapping (see the
.Sy keytime
option).
If the option is not set, the editor waits until enough keys are
entered to resolve the ambiguity, regardless of how long it takes.
#endif
.It Li "ttywerase [off]"
.Nm \&Vi
only.
#ifdef MANUAL
Select an alternate erase algorithm.
#endif
#ifdef REFERENCE
This option changes how
.Nm \&vi
does word erase during text input.
If this option is set, text is broken up into two classes,
blank characters and non-blank characters.
Changing from one class to another marks the end of a word.
#endif
.It Li "verbose [off]"
.NM \&Vi
only.
#ifdef MANUAL
Display an error message for every error.
#endif
#ifdef REFERENCE
.Nm \&Vi
historically bells the terminal for many obvious mistakes, e.g. trying
to move past the left-hand margin, or past the end of the file.
If this option is set, an error message is displayed for all errors.
#endif
.It Li "w300 [no default]"
.Nm \&Vi
only.
Set the window size if the baud rate is less than 1200 baud.
#ifdef REFERENCE
See the
.Sy window
option for more information.
#endif
.It Li "w1200 [no default]"
.Nm \&Vi
only.
Set the window size if the baud rate is equal to 1200 baud.
#ifdef REFERENCE
See the
.Sy window
option for more information.
#endif
.It Li "w9600 [no default]"
.Nm \&Vi
only.
Set the window size if the baud rate is greater than 1200 baud.
#ifdef REFERENCE
See the
.Sy window
option for more information.
#endif
.It Li "warn [on]"
.Nm \&Ex
only.
This option causes a warning message to the terminal if the file has
been modified, since it was last written, before a
.Sy \&!
command.
.It Li "window, w, wi [environment variable LINES]"
#ifdef MANUAL
Set the window size for the screen.
#endif
#ifdef REFERENCE
This option determines the default number of lines in a screenful,
as written by the
.Sy \&z
command.
It also determines the number of lines scrolled by the
.Nm \&vi
commands
.Sy \&^F
and
.Sy \&^B .
The value of window can be unrelated to the real screen size,
although it starts out as the number of lines on the screen (see
the SCREEN SIZING section).
Setting the value of the
.Sy window
option is the same as using the
.Fl w
command line option.
.Pp
If the value of
.Sy window
(as set by the
.Sy window ,
.Sy w300 ,
.Sy w1200
or
.Sy w9600
options) is smaller than the actual size of the screen, large screen
movements will result in displaying only that smaller number of lines
on the screen.
(Further movements in that same area will result in the screen being
filled.)
This can provide a performance improvement when viewing different
places in one or more files over a slow link.
#endif
.It Li "wrapmargin, wm [0]"
.Nm \&Vi
only.
#ifdef MANUAL
Break lines automatically when they reach the right-hand margin.
#endif
#ifdef REFERENCE
If the value of wrapmargin is non-zero,
.Nm \&vi
will break lines, that are more than that number of characters long,
into two lines at the blank character closest to the value.
If wrapmargin is 0,
or if there is no blank character upon which to break the line,
the line will not be broken.
#endif
.It Li "wrapscan, ws [on]"
#ifdef MANUAL
Set searches to wrap around the end or beginning of the file.
#endif
#ifdef REFERENCE
This option causes searches to wrap around the end or the beginning
of the file, and back to the starting point.
Otherwise, the end or beginning of the file terminates the search.
#endif
.It Li "writeany, wa [off]"
#ifdef MANUAL
Turn off file-overwriting checks.
#endif
#ifdef REFERENCE
If this option is set, file-overwriting checks that would usually be
made before the
.Sy write
and
.Sy xit
commands, or before an automatic write (see the
.Sy autowrite
option), are not made.
This allows a write to any file, provided the file permissions allow it.
#endif
.El