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Linux e VI: Manuale di EX - VI - VIEW
NAME
ex, vi, view -- text editors
SYNOPSIS
ex [-FRrSsv] [-c cmd] [-t tag] [-w size] [file ...]
vi [-eFRrS] [-c cmd] [-t tag] [-w size] [file ...]
view [-eFrS] [-c cmd] [-t tag] [-w size] [file ...]
DESCRIPTION
vi is a screen-oriented text editor. ex is a line-oriented text editor.
ex and vi are different interfaces to the same program, and it is possi-
ble to switch back and forth during an edit session. view is the equiva-
lent of using the -R (read-only) option of vi.
This manual page is the one provided with the nex/nvi versions of the
ex/vi text editors. nex/nvi are intended as bug-for-bug compatible
replacements for the original Fourth Berkeley Software Distribution
(4BSD) ex and vi programs. For the rest of this manual page, nex/nvi is
used only when it's necessary to distinguish it from the historic imple-
mentations of ex/vi.
This manual page is intended for users already familiar with ex/vi. Any-
one 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 FAST STARTUP. It's probably enough to get
you going.
The following options are available:
-c cmd Execute cmd on the first file loaded. Particularly useful for
initial positioning in the file, although cmd is not limited to
positioning commands. This is the POSIX 1003.2 interface for
the historic ``+cmd'' syntax. nex/nvi supports both the old
and new syntax.
-e Start editing in ex mode, as if the command name were ex.
-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.)
-R Start editing in read-only mode, as if the command name was
view, or the readonly option was set.
-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
-r option had not been specified.
-S Run with the secure edit option set, disallowing all access to
external programs.
-s Enter batch mode; applicable only to ex edit sessions. Batch
mode is useful when running 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 ``-'' argument.
nex/nvi supports both the old and new syntax.
-t tag Start editing at the specified tag (see ctags(1)).
-v Start editing in vi mode, as if the command name was vi.
-w size Set the initial window size to the specified number of lines.
Command input for ex/vi is read from the standard input. In the vi
interface, it is an error if standard input is not a terminal. In the ex
interface, if standard input is not a terminal, ex will read commands
from it regardless; however, the session will be a batch mode session,
exactly as if the -s option had been specified.
FAST STARTUP
This section will tell you the minimum amount that you need to do simple
editing tasks using 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 vi and have them
walk you through this section.
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 vi, and for vi to give information to you.
The other fact that you need to understand is that vi is a modeful edi-
tor, 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 <escape> key.
Key names are written using less-than and greater-than signs, e.g.,
<escape> means the ``escape'' key, usually labeled ``Esc'' on your termi-
nal's keyboard. If you're ever confused as to which mode you're in, keep
entering the <escape> key until vi beeps at you. Generally, vi will beep
at you if you try and do something that's not allowed. It will also dis-
play error messages.
To start editing a file, enter the following command:
$ vi file
The command you should enter as soon as you start editing is:
:set verbose showmode
This will make the editor give you verbose error messages and display the
current mode at the bottom of the screen.
The commands to move around the file are:
h Move the cursor left one character.
j Move the cursor down one line.
k Move the cursor up one line.
l Move the cursor right one character.
<cursor-arrows>
The cursor arrow keys should work, too.
/text Search for the string ``text'' in the file, and move the cursor
to its first character.
The commands to enter new text are:
a Append new text, after the cursor.
i Insert new text, before the cursor.
o Open a new line below the line the cursor is on, and start
entering text.
O Open a new line above the line the cursor is on, and start
entering text.
<escape> Once you've entered input mode using one of the a, i, o or O
commands, use <escape> to quit entering text and return to com-
mand mode.
The commands to copy text are:
yy Copy the line the cursor is on.
p Append the copied line after the line the cursor is on.
The commands to delete text are:
dd Delete the line the cursor is on.
x Delete the character the cursor is on.
The commands to write the file are:
:w Write the file back to the file with the name that you originally
used as an argument on the vi command line.
:w file_name
Write the file back to the file with the name file_name.
The commands to quit editing and exit the editor are:
:q Quit editing and leave vi (if you've modified the file, but not
saved your changes, vi will refuse to quit).
:q! Quit, discarding any modifications that you may have made.
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 ``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.
REGULAR EXPRESSIONS
ex/vi supports regular expressions (REs), as documented in re_format(7),
for line addresses, as the first part of the ex substitute, global and v
commands, and in search patterns. Basic regular expressions (BREs) are
enabled by default; extended regular expressions (EREs) are used if the
extended option is enabled. The use of regular expressions can be
largely disabled using the magic option.
The following strings have special meanings in the ex/vi version of regu-
lar expressions:
+o An empty regular expression is equivalent to the last regular expres-
sion used.
+o `\<' matches the beginning of the word.
+o `\>' matches the end of the word.
+o `~' matches the replacement part of the last substitute command.
BUFFERS
A buffer is an area where commands can save changed or deleted text for
later use. vi buffers are named with a single character preceded by a
double quote, for example "<c>; ex buffers are the same, but without the
double quote. nex/nvi permits the use of any character without another
meaning in the position where a buffer name is expected.
All buffers are either in line mode or 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 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 cur-
rent line itself will be split. All ex commands which store text into
buffers do so in line mode. The behaviour of vi commands depend on their
associated motion command:
+o <control-A>, h, l, ,, 0, B, E, F, T, W, ^, b, e, f and t make the
destination buffer character-oriented.
+o j, <control-M>, k, ', -, G, H, L, M, _ and | make the destination
buffer line-oriented.
+o $, %, `, (, ), /, ?, [[, ]], { and } 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.
The ex command display buffers displays the current mode for each buffer.
Buffers named `a' through `z' may be referred to using their uppercase
equivalent, in which case new content will be appended to the buffer,
instead of replacing it.
Buffers named `1' through `9' are special. A region of text modified
using the c (change) or d (delete) commands is placed into the numeric
buffer `1' if no other buffer is specified and if it meets one of the
following conditions:
+o It includes characters from more than one line.
+o It is specified using a line-oriented motion.
+o It is specified using one of the following motion commands:
<control-A>, `<character>, n, N, %, /, {, }, (, ), and ?.
Before this copy is done, the previous contents of buffer `1' are moved
into buffer `2', `2' into buffer `3', and so on. The contents of buffer
`9' are discarded. Note that this rotation occurs regardless of the user
specifying another buffer. In 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 vi mode.
VI COMMANDS
The following section describes the commands available in the command
mode of the vi editor. The following words have a special meaning in the
commands description:
bigword A set of non-whitespace characters.
buffer Temporary area where commands may place text. If not specified,
the default buffer is used. See also BUFFERS, above.
count A positive number used to specify the desired number of itera-
tions of a command. It defaults to 1 if not specified.
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.
word A sequence of letters, digits or underscores.
buffer and count, if both present, may be specified in any order. motion
and count, if both present, are effectively multiplied together and con-
sidered part of the motion.
<control-A>
Search forward for the word starting at the cursor position.
[count] <control-B>
Page backwards count screens. Two lines of overlap are main-
tained, if possible.
[count] <control-D>
Scroll forward count lines. If count is not given, scroll for-
ward the number of lines specified by the last <control-D> or
<control-U> command. If this is the first <control-D> command,
scroll half the number of lines in the current screen.
[count] <control-E>
Scroll forward count lines, leaving the current line and column
as is, if possible.
[count] <control-F>
Page forward count screens. Two lines of overlap are maintained,
if possible.
<control-G>
Display the following file information: the file name (as given
to 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.
[count] <control-H>
[count] h
Move the cursor back count characters in the current line.
[count] <control-J>
[count] <control-N>
[count] j
Move the cursor down count lines without changing the current
column.
<control-L>
<control-R>
Repaint the screen.
[count] <control-M>
[count] +
Move the cursor down count lines to the first non-blank character
of that line.
[count] <control-P>
[count] k
Move the cursor up count lines, without changing the current col-
umn.
<control-T>
Return to the most recent tag context.
[count] <control-U>
Scroll backwards count lines. If count is not given, scroll
backwards the number of lines specified by the last <control-D>
or <control-U> command. If this is the first <control-U> com-
mand, scroll half the number of lines in the current screen.
<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.
[count] <control-Y>
Scroll backwards count lines, leaving the current line and column
as is, if possible.
<control-Z>
Suspend the current editor session.
<escape>
Execute the ex command being entered, or cancel it if it is only
partial.
<control-]>
Push a tag reference onto the tag stack.
<control-^>
Switch to the most recently edited file.
[count] <space>
[count] l
Move the cursor forward count characters without changing the
current line.
[count] ! motion shell-argument(s) <carriage-return>
Replace the lines spanned by count and motion with the output
(standard output and standard error) of the program named by the
shell option, called with a -c flag followed by the
shell-argument(s) (bundled into a single argument). Within
shell-argument(s), the `%', `#' and `!' characters are expanded
to the current file name, the previous current file name, and the
command text of the previous ! or :! commands, respectively. The
special meaning of `%', `#' and `!' can be overridden by escaping
them with a backslash.
[count] # #|+|-
Increment (trailing `#' or `+') or decrement (trailing `-') the
number under the cursor by count, starting at the cursor position
or at the first non-blank character following it. Numbers with a
leading `0x' or `0X' are interpreted as hexadecimal numbers.
Numbers with a leading `0' are interpreted as octal numbers
unless they contain a non-octal digit. Other numbers may be pre-
fixed with a `+' or `-' sign.
[count] $
Move the cursor to the end of a line. If count is specified,
additionally move the cursor down count - 1 lines.
% Move to the matchchars character matching the one found at the
cursor position or the closest to the right of it.
& Repeat the previous substitution command on the current line.
'<character>
`<character>
Return to the cursor position marked by the character character,
or, if character is `'' or ``', to the position of the cursor
before the last of the following commands: <control-A>,
<control-T>, <control-]>, %, ', `, (, ), /, ?, G, H, L, [[, ]],
{, }. The first form returns to the first non-blank character of
the line marked by character. The second form returns to the
line and column marked by character.
[count] (
[count] )
Move count sentences backward or forward, respectively. A sen-
tence 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, fol-
lowed by either an end-of-line or two whitespace characters.
Groups of empty lines (or lines containing only whitespace
characters) are treated as a single sentence.
[count] ,
Reverse find character (i.e., the last F, f, T or t command)
count times.
[count] -
Move to the first non-blank character of the previous line, count
times.
[count] .
Repeat the last vi command that modified text. count replaces
both the count argument of the repeated command and that of the
associated motion. If the . command repeats the u command, the
change log is rolled forward or backward, depending on the action
of the u command.
/RE <carriage-return>
/RE/ [offset] [z] <carriage-return>
?RE <carriage-return>
?RE? [offset] [z] <carriage-return>
N
n Search forward (`/') or backward (`?') for a regular expression.
n and N repeat the last search in the same or opposite direc-
tions, respectively. If RE is empty, the last search regular
expression is used. If offset is specified, the cursor is placed
offset lines before or after the matched regular expression. If
either n or N commands are used as motion components for the !
command, there will be no prompt for the text of the command and
the previous ! 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 z command may be appended to the closed
search expressions to reposition the result line.
0 Move to the first character in the current line.
: Execute an ex command.
[count] ;
Repeat the last character find (i.e., the last .Cm F, f, T or t
command) count times.
[count] < motion
[count] > motion
Shift count lines left or right, respectively, by an amount of
shiftwidth.
@ buffer
Execute a named buffer as vi commands. The buffer may include ex
commands too, but they must be expressed as a : command. If
buffer is `@' or `*', then the last buffer executed shall be
used.
[count] A
Enter input mode, appending the text after the end of the line.
If a count argument is given, the characters input are repeated
count - 1 times after input mode is exited.
[count] B
Move backwards count bigwords.
[buffer] C
Change text from the current position to the end-of-line. If
buffer is specified, ``yank'' the deleted text into buffer.
[buffer] D
Delete text from the current position to the end-of-line. If
buffer is specified, ``yank'' the deleted text into buffer.
[count] E
Move forward count end-of-bigwords.
[count] F <character>
Search count times backward through the current line for
<character>.
[count] G
Move to line count, or the last line of the file if count is not
specified.
[count] H
Move to the screen line count - 1 lines below the top of the
screen.
[count] I
Enter input mode, inserting the text at the beginning of the
line. If a count argument is given, the characters input are
repeated count - 1 more times.
[count] J
Join 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.
[count] L
Move to the screen line count - 1 lines above the bottom of the
screen.
M Move to the screen line in the middle of the screen.
[count] O
Enter input mode, appending text in a new line above the current
line. If a count argument is given, the characters input are
repeated count - 1 more times.
[buffer] P
Insert text from buffer before the current column if buffer is
character-oriented or before the current line if it is line-ori-
ented.
Q Exit vi (or visual) mode and switch to ex mode.
[count] R
Enter input mode, replacing the characters in the current line.
If a count argument is given, the characters input are repeated
count - 1 more times upon exit from insert mode.
[buffer] [count] S
Substitute count lines. If buffer is specified, ``yank'' the
deleted text into buffer.
[count] T <character>
Search backwards, count times, through the current line for the
character after the specified <character>.
U Restore the current line to its state before the cursor last
moved to it.
[count] W
Move forward count bigwords.
[buffer] [count] X
Delete count characters before the cursor, on the current line.
If buffer is specified, ``yank'' the deleted text into buffer.
[buffer] [count] Y
Copy (or ``yank'') count lines into buffer.
ZZ Write the file and exit vi if there are no more files to edit.
Entering two ``quit'' commands in a row ignores any remaining
file to edit.
[count] [[
Back up count section boundaries.
[count] ]]
Move forward count section boundaries.
^ Move to the first non-blank character on the current line.
[count] _
Move down count - 1 lines, to the first non-blank character.
[count] a
Enter input mode, appending the text after the cursor. If a
count argument is given, the characters input are repeated count
number of times.
[count] b
Move backwards count words.
[buffer] [count] c motion
Change the region of text described by count and motion. If
buffer is specified, ``yank'' the changed text into buffer.
[buffer] [count] d motion
Delete the region of text described by count and motion. If
buffer is specified, ``yank'' the deleted text into buffer.
[count] e
Move forward count end-of-words.
[count] f <character>
Search forward, count times, through the rest of the current line
for <character>.
[count] i
Enter input mode, inserting the text before the cursor. If a
count argument is given, the characters input are repeated count
number of times.
m <character>
Save the current context (line and column) as <character>.
[count] o
Enter input mode, appending text in a new line under the current
line. If a count argument is given, the characters input are
repeated count - 1 more times.
[buffer] p
Append text from buffer. Text is appended after the current col-
umn if buffer is character oriented, or after the current line
otherwise.
[count] r <character>
Replace count characters with character.
[buffer] [count] s
Substitute count characters in the current line starting with the
current character. If buffer is specified, ``yank'' the substi-
tuted text into buffer.
[count] t <character>
Search forward, count times, through the current line for the
character immediately before <character>.
u Undo the last change made to the file. If repeated, the u com-
mand alternates between these two states. The . command, when
used immediately after u, causes the change log to be rolled for-
ward or backward, depending on the action of the u command.
[count] w
Move forward count words.
[buffer] [count] x
Delete count characters at the current cursor position, but no
more than there are till the end of the line.
[buffer] [count] y motion
Copy (or ``yank'') a text region specified by count and motion
into a buffer.
[count1] z [count2] type
Redraw, optionally repositioning and resizing the screen. If
count2 is specified, limit the screen size to count2 lines. The
following type characters may be used:
+ If count1 is specified, place the line count1 at the top
of the screen. Otherwise, display the screen after the
current screen.
<carriage-return>
Place the line count1 at the top of the screen.
. Place the line count1 in the center of the screen.
- Place the line count1 at the bottom of the screen.
^ If count1 is given, display the screen before the screen
before count1 (i.e., 2 screens before). Otherwise, dis-
play the screen before the current screen.
[count] {
Move backward count paragraphs.
[column] |
Move to a specific column position on the current line. If
column is omitted, move to the start of the current line.
[count] }
Move forward count paragraphs.
[count] ~ motion
If the tildeop option is not set, reverse the case of the next
count character(s) and no motion can be specified. Otherwise
motion is mandatory and ~ reverses the case of the characters in
a text region specified by the count and motion.
<interrupt>
Interrupt the current operation. The <interrupt> character is
usually <control-C>.
VI TEXT INPUT COMMANDS
The following section describes the commands available in the text input
mode of the vi editor.
<nul> Replay the previous input.
<control-D>
Erase to the previous shiftwidth column boundary.
^<control-D>
Erase all of the autoindent characters, and reset the autoindent
level.
0<control-D>
Erase all of the autoindent characters.
<control-T>
Insert sufficient <tab> and <space> characters to move forward to
the next shiftwidth column boundary.
<erase>
<control-H>
Erase the last character.
<literal next>
Escape the next character from any special meaning. The
<literal next> character is usually <control-V>.
<escape>
Resolve all text input into the file, and return to command mode.
<line erase>
Erase the current line.
<control-W>
<word erase>
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. The
<interrupt> character is usually <control-C>.
EX COMMANDS
The following section describes the commands available in the ex editor.
In each entry below, the tag line is a usage synopsis for the command.
<end-of-file>
Scroll the screen.
! argument(s)
[range] ! argument(s)
Execute a shell command, or filter lines through a shell command.
" A comment.
[range] nu[mber] [count] [flags]
[range] # [count] [flags]
Display the selected lines, each preceded with its line number.
@ buffer
* buffer
Execute a buffer.
[range] <[< ...] [count] [flags]
Shift lines left.
[line] = [flags]
Display the line number of line. If line is not specified, dis-
play the line number of the last line in the file.
[range] >[> ...] [count] [flags]
Shift lines right.
ab[breviate] lhs rhs
vi only. Add lhs as an abbreviation for rhs to the abbreviation
list.
[line] a[ppend][!]
The input text is appended after the specified line.
ar[gs] Display the argument list.
bg vi only. Background the current screen.
[range] c[hange][!] [count]
The input text replaces the specified range.
chd[ir][!] [directory]
cd[!] [directory]
Change the current working directory.
[range] co[py] line [flags]
[range] t line [flags]
Copy the specified lines after the destination line.
cs[cope] add | find | help | kill | reset
Execute a Cscope command.
[range] d[elete] [buffer] [count] [flags]
Delete the lines from the file.
di[splay] b[uffers] | c[onnections] | s[creens] | t[ags]
Display buffers, Cscope connections, screens or tags.
[Ee][dit][!] [+cmd] [file]
[Ee]x[!] [+cmd] [file]
Edit a different file.
exu[sage] [command]
Display usage for an ex command.
f[ile] [file]
Display and optionally change the file name.
[Ff]g [name]
vi mode only. Foreground the specified screen.
[range] g[lobal] /pattern/ [commands]
[range] v /pattern/ [commands]
Apply commands to lines matching (`global') or not matching (`v')
a pattern.
he[lp] Display a help message.
[line] i[nsert][!]
The input text is inserted before the specified line.
[range] j[oin][!] [count] [flags]
Join lines of text together.
[range] l[ist] [count] [flags]
Display the lines unambiguously.
map[!] [lhs rhs]
Define or display maps (for vi only).
[line] ma[rk] <character>
[line] k <character>
Mark the line with the mark <character>.
[range] m[ove] line
Move the specified lines after the target line.
mk[exrc][!] file
Write the abbreviations, editor options and maps to the specified
file.
[Nn][ext][!] [file ...]
Edit the next file from the argument list.
pre[serve]
Save the file in a form that can later be recovered using the ex
-r option.
[Pp]rev[ious][!]
Edit the previous file from the argument list.
[range] p[rint] [count] [flags]
Display the specified lines.
[line] pu[t] [buffer]
Append buffer contents to the current line.
q[uit][!]
End the editing session.
[line] r[ead][!] [file]
Read a file.
rec[over] file
Recover file if it was previously saved.
res[ize] [+|-]size
vi mode only. Grow or shrink the current screen.
rew[ind][!]
Rewind the argument list.
se[t] [option[=[value]] ...] [nooption ...] [option? ...] [all]
Display or set editor options.
sh[ell]
Run a shell program.
so[urce] file
Read and execute ex commands from a file.
[range] s[ubstitute] [/pattern/replace/] [options] [count] [flags]
[range] & [options] [count] [flags]
[range] ~ [options] [count] [flags]
Make substitutions. The replace field may contain any of the
following sequences:
`&' The text matched by pattern.
`~' The replacement part of the previous substitute command.
`%' If this is the entire replace pattern, the replacement
part of the previous substitute command.
`\#' Where `#' is an integer from 1 to 9, the text matched by
the #'th subexpression in pattern.
`\L' Causes the characters up to the end of the line of the
next occurrence of `\E' or `\e' to be converted to lower-
case.
`\l' Causes the next character to be converted to lowercase.
`\U' Causes the characters up to the end of the line of the
next occurrence of `\E' or `\e' to be converted to upper-
case.
`\u' Causes the next character to be converted to uppercase.
su[spend][!]
st[op][!]
<suspend>
Suspend the edit session. The <suspend> character is usually
<control-Z>.
[Tt]a[g][!] tagstring
Edit the file containing the specified tag.
tagn[ext][!]
Edit the file containing the next context for the current tag.
tagp[op][!] [file | number]
Pop to the specified tag in the tags stack.
tagpr[ev][!]
Edit the file containing the previous context for the current
tag.
tagt[op][!]
Pop to the least recent tag on the tags stack, clearing the
stack.
una[bbreviate] lhs
vi only. Delete an abbreviation.
u[ndo] Undo the last change made to the file.
unm[ap][!] lhs
Unmap a mapped string.
ve[rsion]
Display the version of the ex/vi editor.
[line] vi[sual] [type] [count] [flags]
ex mode only. Enter vi.
[Vi]i[sual][!] [+cmd] [file]
vi mode only. Edit a new file.
viu[sage] [command]
Display usage for a vi command.
[range] w[rite][!] [>>] [file]
[range] w[rite] [!] [file]
[range] wn[!] [>>] [file]
[range] wq[!] [>>] [file]
Write the file.
[range] x[it][!] [file]
Exit the editor, writing the file if it has been modified.
[range] ya[nk] [buffer] [count]
Copy the specified lines to a buffer.
[line] z [type] [count] [flags]
Adjust the window.
SET OPTIONS
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 abbre-
viations and their default values.
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.
Options apply to both ex and vi modes, unless otherwise specified.
altwerase [off]
vi only. Select an alternate word erase algorithm.
autoindent, ai [off]
Automatically indent new lines.
autoprint, ap [on]
ex only. Display the current line automatically.
autowrite, aw [off]
Write modified files automatically when changing files or sus-
pending the editor session.
backup [""]
Back up files before they are overwritten.
beautify, bf [off]
Discard control characters.
cdpath [environment variable CDPATH, or current directory]
The directory paths used as path prefixes for the cd command.
cedit [no default]
Set the character to edit the colon command-line history.
columns, co [80]
Set the number of columns in the screen.
comment [off]
vi only. Skip leading comments in shell, C and C++ language
files.
directory, dir [environment variable TMPDIR, or /tmp]
The directory where temporary files are created.
edcompatible, ed [off]
Remember the values of the `c' and `g' suffixes to the substitute
commands, instead of initializing them as unset for each new com-
mand.
errorbells, eb [off]
ex only. Announce error messages with a bell.
escapetime [1]
The tenths of a second ex/vi waits for a subsequent key to com-
plete an <escape> key mapping.
exrc, ex [off]
Read the startup files in the local directory.
extended [off]
Use extended regular expressions (EREs) rather than basic regular
expressions (BREs). See re_format(7) for more information on
regular expressions.
filec [<tab>]
Set the character to perform file path completion on the colon
command line.
fileencoding, fe [auto detect]
Set the encoding of the current file.
flash [on]
Flash the screen instead of beeping the keyboard on error.
hardtabs, ht [0]
Set the spacing between hardware tab settings. This option cur-
rently has no effect.
iclower [off]
Makes all regular expressions case-insensitive, as long as an
upper-case letter does not appear in the search string.
ignorecase, ic [off]
Ignore case differences in regular expressions.
inputencoding, ie [locale]
Set the encoding of your input characters.
keytime [6]
The tenths of a second ex/vi waits for a subsequent key to com-
plete a key mapping.
leftright [off]
vi only. Do left-right scrolling.
lines, li [24]
vi only. Set the number of lines in the screen.
lisp [off]
vi only. Modify various search commands and options to work with
Lisp. This option is not yet implemented.
list [off]
Display lines in an unambiguous fashion.
lock [on]
Attempt to get an exclusive lock on any file being edited, read
or written.
magic [on]
When turned off, all regular expression characters except for `^'
and `$' are treated as ordinary characters. Preceding individual
characters by `\' re-enables them.
matchchars [[]{}()]
Character pairs looked for by the % command.
matchtime [7]
vi only. The tenths of a second ex/vi pauses on the matching
character when the showmatch option is set.
mesg [on]
Permit messages from other users.
msgcat [/usr/share/vi/catalog/]
Selects a message catalog to be used to display error and infor-
mational messages in a specified language.
modelines, modeline [off]
Read the first and last few lines of each file for ex commands.
This option will never be implemented.
noprint [""]
Characters that are never handled as printable characters.
number, nu [off]
Precede each line displayed with its current line number.
octal [off]
Display unknown characters as octal numbers, instead of the
default hexadecimal.
open [on]
ex only. If this option is not set, the open and visual commands
are disallowed.
optimize, opt [on]
vi only. Optimize text throughput to dumb terminals. This
option is not yet implemented.
paragraphs, para [IPLPPPQPP LIpplpipbp]
vi only. Define additional paragraph boundaries for the { and }
commands.
path [""]
Define additional directories to search for files being edited.
print [""]
Characters that are always handled as printable characters.
prompt [on]
ex only. Display a command prompt.
readonly, ro [off]
Mark the file and session as read-only.
recdir [/var/tmp/vi.recover]
The directory where recovery files are stored.
redraw, re [off]
vi only. Simulate an intelligent terminal on a dumb one. This
option is not yet implemented.
remap [on]
Remap keys until resolved.
report [5]
Set the number of lines about which the editor reports changes or
yanks.
ruler [off]
vi only. Display a row/column ruler on the colon command line.
scroll, scr [window size / 2]
Set the number of lines scrolled.
searchincr [off]
Makes the / and ? commands incremental.
sections, sect [NHSHH HUnhsh]
vi only. Define additional section boundaries for the [[ and ]]
commands.
secure [off]
Turns off all access to external programs.
shell, sh [environment variable SHELL, or /bin/sh]
Select the shell used by the editor.
shellmeta [~{[*?$`'"\]
Set the meta characters checked to determine if file name expan-
sion is necessary.
shiftwidth, sw [8]
Set the autoindent and shift command indentation width.
showmatch, sm [off]
vi only. Note the left matching characters when the right ones
are inserted.
showmode, smd [off]
vi only. Display the current editor mode and a ``modified''
flag.
sidescroll [16]
vi only. Set the amount a left-right scroll will shift.
slowopen, slow [off]
Delay display updating during text input. This option is not yet
implemented.
sourceany [off]
Read startup files not owned by the current user. This option
will never be implemented.
tabstop, ts [8]
This option sets tab widths for the editor display.
taglength, tl [0]
Set the number of significant characters in tag names.
tags, tag [tags]
Set the list of tags files.
term, ttytype, tty [environment variable TERM]
Set the terminal type.
terse [off]
This option has historically made editor messages less verbose.
It has no effect in this implementation.
tildeop [off]
Modify the ~ command to take an associated motion.
timeout, to [on]
Time out on keys which may be mapped.
ttywerase [off]
vi only. Select an alternate erase algorithm.
verbose [off]
vi only. Display an error message for every error.
w300 [no default]
vi only. Set the window size if the baud rate is less than 1200
baud.
w1200 [no default]
vi only. Set the window size if the baud rate is equal to 1200
baud.
w9600 [no default]
vi only. Set the window size if the baud rate is greater than
1200 baud.
warn [on]
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 ! command.
window, w, wi [environment variable LINES - 1]
Set the window size for the screen.
windowname [off]
Change the icon/window name to the current file name.
wraplen, wl [0]
vi only. Break lines automatically, the specified number of col-
umns from the left-hand margin. If both the wraplen and
wrapmargin edit options are set, the wrapmargin value is used.
wrapmargin, wm [0]
vi only. Break lines automatically, the specified number of col-
umns from the right-hand margin. If both the wraplen and
wrapmargin edit options are set, the wrapmargin value is used.
wrapscan, ws [on]
Set searches to wrap around the end or beginning of the file.
writeany, wa [off]
Turn off file-overwriting checks.
ENVIRONMENT
COLUMNS The number of columns on the screen. This value overrides any
system or terminal specific values. If the COLUMNS environment
variable is not set when ex/vi runs, or the columns option is
explicitly reset by the user, ex/vi enters the value into the
environment.
EXINIT A list of ex startup commands, read after /etc/vi.exrc unless
the variable NEXINIT is also set.
HOME The user's home directory, used as the initial directory path
for the startup $HOME/.nexrc and $HOME/.exrc files. This value
is also used as the default directory for the cd command.
LINES The number of rows on the screen. This value overrides any sys-
tem or terminal specific values. If the LINES environment vari-
able is not set when ex/vi runs, or the lines option is explic-
itly reset by the user, ex/vi enters the value into the environ-
ment.
NEXINIT A list of ex startup commands, read after /etc/vi.exrc.
SHELL The user's shell of choice (see also the shell option).
TERM The user's terminal type. The default is the type ``unknown''.
If the TERM environment variable is not set when ex/vi runs, or
the term option is explicitly reset by the user, ex/vi enters
the value into the environment.
TMPDIR The location used to store temporary files (see also the
directory edit option).
ASYNCHRONOUS EVENTS
SIGALRM vi/ex uses this signal for periodic backups of file modifica-
tions and to display ``busy'' messages when operations are
likely to take a long time.
SIGHUP
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 vi/ex reference manual sec-
tion Recovery for more information.
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.
SIGWINCH The screen is resized. See the vi/ex reference manual section
Sizing the Screen for more information.
FILES
/bin/sh The default user shell.
/etc/vi.exrc System-wide vi startup file. It is read for ex com-
mands first in the startup sequence. Must be owned
by root or the user, and writable only by the owner.
/tmp Temporary file directory.
/var/tmp/vi.recover The default recovery file directory.
$HOME/.nexrc First choice for user's home directory startup file,
read for ex commands right after /etc/vi.exrc unless
either NEXINIT or EXINIT are set. Must be owned by
root or the user, and writable only by the owner.
$HOME/.exrc Second choice for user's home directory startup
file, read for ex commands under the same conditions
as $HOME/.nexrc.
.nexrc First choice for local directory startup file, read
for ex commands at the end of the startup sequence
if the exrc option was turned on earlier. Must be
owned by the user and writable only by the owner.
.exrc Second choice for local directory startup file, read
for ex commands under the same conditions as .nexrc.
EXIT STATUS
The ex and vi utilities exit 0 on success, and >0 if an error occurs.
SEE ALSO
ctags(1), iconv(1), re_format(7)
STANDARDS
nex/nvi is close to IEEE Std 1003.1-2008 (``POSIX.1''). That document
differs from historical ex/vi practice in several places; there are
changes to be made on both sides.
HISTORY
The ex editor first appeared in 1BSD. The nex/nvi replacements for the
ex/vi editor first appeared in 4.4BSD.
AUTHORS
Bill Joy wrote the original version of ex in 1977.
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