407 lines
10 KiB
Groff
407 lines
10 KiB
Groff
.\" Copyright (c) 1994
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" from: @(#)vi.1 8.7 (Berkeley) 1/23/94
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.\" $Id: vi.1,v 1.3 1994/01/24 07:12:26 cgd Exp $
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.\"
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.Dd "January 23, 1994"
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.Dt EX/VI 1
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.Os
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.Sh Name
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.Nm ex, vi, view
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.Nd text editors
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.Sh SYNOPSIS
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.Nm vi
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.Op Fl eFlRv
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.Op Fl c Ar command
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.Op Fl r Ar file
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.Op Fl t Ar tag
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.Op Fl w Ar size
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.Op Fl x Ar aw
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.br
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.Nm view
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.Op Fl eFlRv
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.Op Fl c Ar command
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.Op Fl r Ar file
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.Op Fl t Ar tag
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.Op Fl w Ar size
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.Op Fl x Ar aw
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.br
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.Nm ex
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.Op Fl eFlRsv
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.Op Fl c Ar command
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.Op Fl r Ar file
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.Op Fl t Ar tag
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.Op Fl w Ar size
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.Op Fl x Ar aw
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.Sh DESCRIPTION
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.Nm \&Ex
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is a line-oriented text editor.
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.Nm Vi
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is a screen oriented text editor, based on
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.Nm ex .
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.Nm View
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is the same as using the
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.Fl R
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(read-only) option of
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.Nm vi .
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.Nm \&Ex
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and
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.Nm vi
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are really different interfaces to the same program,
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and it is possible to switch back and forth during the same edit session.
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.Pp
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This manual page is the one provided with the
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.Nm nex
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and
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.Nm nvi
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versions of the vi text editors.
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.Nm Nex
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and
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.Nm nvi
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are intended as bug-for-bug compatible replacements for the original
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Fourth Berkeley Software Distribution (4BSD)
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.Nm ex
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and
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.Nm vi
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programs.
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.Pp
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The following options are available:
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.Bl -tag -width indent
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.It Fl c
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Execute
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.Ar command
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immediately after starting the edit session.
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Useful for initial positioning in the file, but
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.Ar command
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is not limited to positioning commands.
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This is the POSIX 1003.2 interface for the historic
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.Dq "+command"
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syntax.
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.Nm Nex/nvi
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supports both the old and new syntax.
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.It Fl e
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Start editing in ex mode, as if the command name was
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.Nm ex .
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.It Fl F
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Don't copy the entire file when first starting to edit.
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(The default is to make a copy in case someone else tries to edit
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the file too.)
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.It Fl l
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List the files that may be recovered using the
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.Fl r
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option of
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.Nm vi .
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This is the new interface for the historic
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.Fl r
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without a file argument syntax.
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.Nm Nex/nvi
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supports both the old and new syntax.
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.It Fl R
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Start editing in read-only mode, as if the command name was
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.Nm view .
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.It Fl r
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Recover the specified file.
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.It Fl s
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Enter batch mode; applicable only to
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.Nm ex
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edit sessions.
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Batch mode is useful when running
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.Nm ex
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scripts.
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Prompts, informative messages and other user oriented things are
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turned off.
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This is the POSIX 1003.2 interface for the historic
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.Fl \-
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syntax.
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.Nm Nex/nvi
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supports both the old and new syntax.
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.It Fl t
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Start editing at the specified tag.
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(See
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.Xr ctags 1 ).
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.It Fl w
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Set the initial window size to the specified number of lines.
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.It Fl v
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Start editing in vi mode, as if the command name was
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.Nm vi
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or
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.Nm view .
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.It Fl x
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Reserved for X11 interfaces.
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Not currently implemented.
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.Sh ADDITIONAL FEATURES
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This manual page is the one distributed with the
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.Nm nvi
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and
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.Nm nex
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reimplementations of
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.Nm ex/vi .
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There are a few additional features in
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.Nm nex/nvi .
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.Bl -tag -width indent
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.It "8-bit clean data, large lines, files"
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.Nm Nvi/nex
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will edit any format file.
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Line lengths are limited by available memory,
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and file sizes are limited by available disk space.
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The command
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.Dq "^Vx[0-9A-Fa-f]* ,"
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in input mode, will insert any
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legal character value into the text.
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.It "Split screens"
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The command
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.Dq ":sp[lit] [file ...]"
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splits the screen in vi mode.
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The key
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.Dq "^W"
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switches between the foreground screens,
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and the
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.Dq ":resize count"
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command can be used to grow or shrink any
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particular screen.
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.It "Background and foreground screens"
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The command
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.Dq ":bg"
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backgrounds the current screen,
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and the command
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.Dq ":fg [file]"
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foregrounds the backgrounded screeen
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that is editing the specified file, or, by default, the first background
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screen on the queue.
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The command
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.Dq ":di[splay] s[creens]"
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lists the background screens.
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.It "Shell screens"
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The command
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.Dq ":sc[ript] [file ...]"
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runs a shell in the screen.
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Editing is unchanged, with the exception that a <carriage-return>
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enters the current line (stripped of any prompt) as input to the
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shell.
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.It "Tag stacks"
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Tags are now maintained in a stack.
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The command
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.Dq "^T"
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returns to the previous tag location.
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The command
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.Dq ":tagpop [number \| file]"
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returns to the most recent tag
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location by default, or, optionally to a specific tag number in the
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tag stack, or the most recent tag from the specified file.
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Use the command
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.Dq ":di[splay] t[ags]"
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to view the tags stack.
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The command
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.Dq ":tagtop"
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returns to the top of the tag stack.
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.It "New displays"
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The command
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.Dq ":di[splay] b[uffers] \| s[creens] \| t[ags]"
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can be
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used to display, respectively, the current cut buffers,
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the backgrounded screens, and the tags stack.
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.It "Infinite undo"
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The changes made during an edit session may be rolled backward and
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forward.
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A '.' command immediately after a 'u' command continues either forward
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or backward depending on whether the 'u' command was an undo or a redo.
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.It "Usage information"
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The command
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.Dq ":exu[sage [cmd]"
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and
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.Dq "viu[sage] [key]"
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provide usage
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information for all of the ex and vi commands by default, or, optionally,
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for a specific command or key.
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.It "Extended regular expressions"
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The
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.Dq ":set extended"
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command treats search and other command regular
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expressions as extended (egrep(1) style) regular expressions.
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.It "Word search"
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The command
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.Dq "^A"
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searches for the word referenced by the cursor.
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.It "Number increment"
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The command
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.Dq "#"
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increments the number referenced by the cursor.
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.It "Previous file"
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The command
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.Dq ":prev[ious][!]"
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edits the previous file from the
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argument list.
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.It "Left-Right scrolling"
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The command
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.Dq ":set leftright"
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makes
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.Nm nvi
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do left-right screen scrolling, instead of the traditional
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.Nm vi
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line wrapping.
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.Sh RECOVERY
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There is no recovery program for nvi, nor does it run setuid.
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Users may recover any file which they may read, and the superuser
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may recover any edit session.
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.Pp
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Edit sessions are backed by files in
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.Pa /var/tmp/vi.recover ,
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and are named
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.Dq "vi.XXXX" ,
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where
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.Dq "XXXX"
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is a number related to the process id.
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When a file is first modified, a second file, which contains an
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email message for the user, is created, and is named
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.Dq "recover.XXXX" ,
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where, again,
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.Dq "XXXX"
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is associated with the process id.
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Both files are removed at the end of a normal edit session,
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but will remain if the edit session is abnormally terminated
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or the user enters the ex/vi
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.Dq "preserve"
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command.
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The use of the
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.Pa /var/tmp
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directory may be changed setting the option
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.Dq "recdir"
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in the user's or system startup information.
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.Pp
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The recovery directory should have the
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.Dq "sticky-bit"
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set so that only the owners of files may remove them.
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If this is not possible on the system, then a pseudo-user should
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own the recovery directory.
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The recovery directory must be both read and write-able by
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any user.
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.Pp
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The recovery file has all of the necessary information in it to enable the
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user to recover the edit session.
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In addition, it has all of the necessary email headers for sendmail.
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When the system is rebooted, all of the files in
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.Pa /var/tmp/vi.recover
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named
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.Dq "recover.XXXX"
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should be sent by email,
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using the
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.Fl t
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flag of sendmail (or a similar mechanism in other mailers).
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A simple way to do this is to insert the following script into your
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rc.local (or other startup) file:
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.sp
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.ne 7v
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.Bd -literal -offset indent -compact
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# Recover nvi editor files.
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virecovery=/var/tmp/vi.recover/recover.*
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if [ "$virecovery" != "/var/tmp/vi.recover/recover.*" ]; then
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echo 'Recovering vi editor sessions'
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for i in $virecovery; do
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sendmail -t < $i
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done
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fi
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.Ed
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.Pp
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If
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.Nm nex/nvi
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receives a hangup (SIGHUP) signal, it will email the recovery
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information to the user itself.
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.Pp
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If you don't have the sendmail program on your system, the source file
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.Pa nvi/recover.c
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will have to be modified to use your mail delivery programs.
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.Sh BUGS
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This man page is woefully incomplete.
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.Pp
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Many and varied.
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See the file
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.Pa nvi/docs/bugs.current
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for a list of the known bugs in this version.
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.Sh FILES
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.Bl -tag -width XXXX/var/tmp/vi.recover -compact
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.It Pa /tmp
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Storage for temporary files.
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.It Pa /var/tmp/vi.recover
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Storage for recovery files.
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.El
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.Sh SEE ALSO
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.Xr ctags 1 ,
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.Xr more 1 ,
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.Xr curses 3 ,
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.Xr dbopen 3
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.sp
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The
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.Dq "Vi Quick Reference"
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card.
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.sp
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.Dq "An Introduction to Display Editing with Vi" ,
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found in the
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.Dq "UNIX User's Manual Supplementary Documents" .
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.sp
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.Dq "Edit: A tutorial" ,
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found in the
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.Dq "UNIX User's Manual Supplementary Documents" .
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.sp
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.Dq "\&Ex Reference Manual (Version 3.7)" ,
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found in the
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.Dq "UNIX User's Manual Supplementary Documents" .
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.Pp
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.Nm Nroff/troff
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source for the previous three documents are distributed with
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.Nm nex/nvi
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in the
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.Pa nvi/docs/USD.doc
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directory of the
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.Nm nex/nvi
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source code.
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.sp
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The files
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.Dq "autowrite" ,
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.Dq "input" ,
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and
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.Dq "quoting" ,
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found in the
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.Pa nvi/docs
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directory of the
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.Nm nex/nvi
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source code.
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.Sh HISTORY
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The
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.Nm nex/nvi
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replacements for
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.Nm ex/vi
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first appeared in 4.4BSD.
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.Sh STANDARDS
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.Nm Nex/nvi
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is fairly close to IEEE Std1003.2 (``POSIX''), but it's
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not there yet.
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