*starting.txt*  For Vim version 5.8a.  Last change: 2000 Nov 16


		  VIM REFERENCE MANUAL    by Bram Moolenaar


Starting Vim						*starting*

1. Vim arguments		|vim-arguments|
2. Vim on the Amiga		|starting-amiga|
3. Running Vim from xargs	|xargs|
4. Initialization		|initialization|
5. Suspending			|suspend|
6. The vimrc file		|vimrc-intro|
7. The viminfo file		|viminfo-file|

==============================================================================
1. Vim arguments					*vim-arguments*

Most often, Vim is started to edit a single file with the command

	vim filename					*-vim*

More generally, Vim is started with:

	vim [option | filename] ..

Option arguments and file name arguments can be mixed, and any number of them
can be given.  However, watch out for options that take an argument.

For compatibility with various Vi versions, see	|cmdline-arguments|.

Exactly one out of the following five items may be used to choose how to
start editing:

							*-file* *---*
filename	One or more file names.  The first one will be the current
		file and read into the buffer.  The cursor will be positioned
		on the first line of the buffer.
		To avoid a file name starting with a '-' being interpreted as
		an option, precede the arglist with "--", e.g.:
			Vim -- -filename
		All arguments after the "--" will be interpreted as file names,
		no other options or "+command" argument can follow.

							*--*
-		This argument can mean two things, depending on whether Ex
		mode is to be used.

		Starting in Normal mode:
>	vim -   or  ex -v -
		Start editing a new buffer, which is filled with text
		that is read from stdin.  The commands that would normally be
		read from stdin will now be read from stderr.  Example:
>			find . -name "*.c" -print | vim -
		The buffer will be marked modified, because it contains text
		that needs to be saved.  Except when in readonly mode, then
		the buffer is not marked modified.  Example:
>			ls | view -

		Starting in Ex mode:
>	ex -    or   vim -e -
		Start editing in silent mode.  See |-s-ex|.

							*-t* *-tag*
-t {tag}	A tag.  "tag" is looked up in the tags file, the associated
		file becomes the current file, and the associated command is
		executed.  Mostly this is used for C programs, in which case
		"tag" often is a function name.  The effect is that the file
		containing that function becomes the current file and the
		cursor is positioned on the start of the function (see
		|tags|).

							*-q* *-qf*
-q [errorfile]	QuickFix mode.  The file with the name [errorfile] is read
		and the first error is displayed.  See |quickfix|.
		If [errorfile] is not given, the 'errorfile' option is used
		for the file name.  See 'errorfile' for the default value.
		{not in Vi}

(nothing)	Without one of the four items above, Vim will start editing a
		new buffer.  It's empty and doesn't have a file name.


The startup mode can be changed by using another name instead of "vim", which
is equal to giving options:
ex	vim -e	    Start in Ex mode (see |Ex-mode|).		    *ex*
view	vim -R	    Start in read-only mode (see |-R|).		    *view*
gvim	vim -g	    Start the GUI (see |gui|).			    *gvim*
gex	vim -eg	    Start the GUI in Ex mode.			    *gex*
gview	vim -Rg	    Start the GUI in read-only mode.		    *gview*
rvim	vim -Z	    Like "vim", but in restricted mode (see |-Z|)   *rvim*
rview	vim -RZ	    Like "view", but in restricted mode.	    *rview*
rgvim	vim -gZ	    Like "gvim", but in restricted mode.	    *rgvim*
rgview	vim -RgZ    Like "gview", but in restricted mode.	    *rgview*

Additional characters may follow, they are ignored.  For example, you can have
"gvim-5" to start the GUI.  You must have an executable by that name then, of
course.

On Unix, you would normally have one executable called Vim, and links from the
different startup-names to that executable.  If your system does not support
links and you do not want to have several copies of the executable, you could
use an alias instead.  For example:
>	alias view   vim -R
>	alias gvim   vim -g

							*startup-options*
The option arguments may be given in any order.  Single-letter options can be
combined after one dash.  There can be no option arguments after the "--"
argument.

--help							*-h* *--help*
-h		Give usage (help) message and exit.  {not in Vi}

							*--version*
--version	Print version information and exit.  Same output as for
		|:version| command.  {not in Vi}

							*-+*
+[num]		The cursor will be positioned on line "num" for the first
		file being edited.  If "num" is missing, the cursor will be
		positioned on the last line.

							*-+/*
+/{pat}		The cursor will be positioned on the first line containing
		"pat" in the first file being edited (see |pattern| for the
		available search patterns).

+{command}						*-+c* *-c*
-c {command}	"command" will be executed after the first file has been
		read (and after autocommands and modelines for that file have
		been processed).  "command" is interpreted as an Ex command.
		If the "command" contains spaces, it must be enclosed in
		double quotes (this depends on the shell that is used).
		Example:
>			vim  "+set si"  main.c
>			vim  -c "set ff=dos"  -c wq  mine.mak

		Note: You can use up to 10 "+" or "-c" arguments in a Vim
		command.  They are executed in the order given. {Vi only
		allows one command}

							*-r*
-r		Recovery mode.  Without a file name argument, a list of
		existing swap files is given.  With a file name, a swap file
		is read to recover a crashed editing session.  See
		|crash-recovery|.

							*-L*
-L		Same as -r.  {only in some versions of Vi: "List recoverable
		edit sessions"}

							*-R*
-R		Readonly mode.  The 'readonly' option will be set for all the
		files being edited.  You can still edit the buffer, but will
		be prevented from accidentally overwriting a file.  If you
		forgot that you are in View mode and did make some changes,
		you can overwrite a file by adding an exclamation mark to
		the Ex command, as in ":w!".  The 'readonly' option can be
		reset with ":set noro" (see the options chapter, |options|).
		Subsequent edits will not be done in readonly mode.  Calling
		the executable "view" has the same effect as the -R argument.
		The 'updatecount' option will be set to 10000, meaning that
		the swap file will not be updated automatically very often.

							*-m*
-m		Modifications not allowed.  The 'write' option will be reset,
		so that writing files is disabled.  The 'write' option can be
		set to enable writing again.

							*-Z* *restricted-mode*
-Z		Restricted mode.  All commands that make use of an external
		shell are disabled.  This includes suspending with CTRL-Z,
		":sh", filtering, the system() function, backtick expansion,
		etc.

							*-g*
-g		Start Vim in GUI mode.  See |gui|.

							*-v*
-v		Start Ex in Vi mode.  Only makes a difference when the
		executable is called "ex" or "gvim".  For gvim the GUI is not
		started if possible.

							*-e*
-e		Start Vim in Ex mode.  Only makes a difference when the
		executable is not called "ex".

							*-s-ex*
-s		Silent or batch mode.  Only when Vim was started as "ex" or
		when preceded with the "-e" argument.  Otherwise see |-s|.
		To be used when Vim is used to execute Ex commands from a file
		instead of a terminal.  Switches off most prompts and
		informative messages.  But not warning and error messages, and
		the output from commands that print text lines, like ":print"
		and ":list".
		Initializations are skipped (except the ones given with the
		"-u" argument).

							*-b*
-b		Binary mode.  File I/O will only recognize <NL> to separate
		lines. The 'expandtab' option will be reset.  The 'textwidth'
		option is set to 0.  'modeline' is reset.  The 'binary' option
		is set.  This is done after reading the vimrc/exrc files but
		before reading any file in the arglist.  See also
		|edit-binary|.  {not in Vi}

							*-l*
-l		Lisp mode.  Sets the 'lisp' and 'showmatch' options on.

							*-F*
-F		Farsi mode.  Sets the 'fkmap' and 'rightleft' options on.
		(Only when compiled with |+rightleft| and |+farsi| features,
		otherwise Vim gives an error message and exits).  {not in Vi}

							*-H*
-H		Hebrew mode.  Sets the 'hkmap' and 'rightleft' options on.
		(Only when compiled with the |+rightleft| feature, otherwise
		Vim gives an error message and exits).  {not in Vi}

							*-V* *verbose*
-V[n]		Verbose.  Sets the 'verbose' option to [n][ (default: 10).
		Messages will be given for each file that is ":source"d and
		for reading or writing a viminfo file.  Can be used to find
		out what is happening upon startup and exit.  {not in Vi}

							*-C*
-C		Compatible mode.  Sets the 'compatible' option.  You can use
		this to get 'compatible', even though there is a .vimrc file.
		Also see |compatible-default|.  {not in Vi}

							*-N*
-N		Not compatible mode.  Resets the 'compatible' option.  You can
		use this to get 'nocompatible', when there is no .vimrc file.
		Also see |compatible-default|.  {not in Vi}

							*-n*
-n		No swap file will be used.  Recovery after a crash will be
		impossible.  Handy if you want to view or edit a file on a
		very slow medium (e.g., a floppy).
		Can also be done with ":set updatecount=0".  You can switch it
		on again by setting the 'updatecount' option to some value,
		e.g., ":set uc=100".
		'updatecount' is set to 0 AFTER executing commands from a
		vimrc file, but before the GUI initializations.  Thus it
		overrides a setting for 'updatecount' in a vimrc file, but not
		in a gvimrc file.  See |startup|.  {not in Vi}
		When you want to reduce accesses to the disk (e.g., for a
		laptop), don't use "-n", but set 'updatetime' and
		'udpatecount' to very big numbers, and type ":preserve" when
		you want to save your work.  This way you keep the possibility
		for crash recovery.

							*-o*
-o[N]		Open N windows.  If [N] is not given, one window is opened
		for every file given as argument.  If there is not enough
		room, only the first few files get a window.  If there are
		more windows than arguments, the last few windows will be
		editing an empty file.  {not in Vi}

							*-T*
-T {terminal}	Set the terminal type to "terminal".  This influences the
		codes that Vim will send to your terminal.  This is normally
		not needed, because Vim will be able to find out what type
		of terminal you are using (See |terminal-info|).  {not in Vi}

							*-d*
-d {device}	Amiga only: The "device" is opened to be used for editing.
		Normally you would use this to set the window position and
		size: "-d con:x/y/width/height", e.g.,
		"-d con:30/10/600/150".  But you can also use it to start
		editing on another device, e.g., AUX:.  {not in Vi}

							*-f*
-f		Amiga: Do not restart Vim to open a new window.  This
		option should be used when Vim is started by a program that
		will wait for the edit session to finish (e.g., mail or
		readnews).  See |amiga-window|.  {not in Vi}

		GUI: Do not disconnect from the program that started Vim.
		'f' stands for "foreground".  If omitted, the GUI forks a new
		process and exits the current one.  "-f" should be used when
		gvim is started by a program that will wait for the edit
		session to finish (e.g., mail or readnews).  If you want gvim
		never to fork, include 'f' in 'guioptions' in your .gvimrc.
		Careful: You can use "-gf" to start the GUI in the foreground,
		but "-fg" is used to specify the foreground color.  {not in
		Vi} |gui-fork|

							*-u*
-u {vimrc}	The file "vimrc" is read for initializations.  Other
		initializations are skipped; see |initialization|.  This can
		be used to start Vim in a special mode, with special
		mappings and settings.  A shell alias can be used to make
		this easy to use.  For example:
>			alias vimc vim -u ~/.c_vimrc !*
		Also consider using autocommands; see |autocommand|.
		When {vimrc} is equal to "NONE" (all uppercase), all
		initializations from files and environment variables are
		skipped, including reading the .gvimrc file when the GUI
		starts.
		Using the "-u" argument also means that the 'compatible'
		option will be on by default.  This can have unexpected side
		effects.  See |'compatible'|.
		{not in Vi}

							*-U*
-U {gvimrc}	The file "gvimrc" is read for initializations when the GUI
		starts.  Other GUI initializations are skipped. When {gvimrc}
		is equal to "NONE", no file is read for initializations at
		all.
		Exception: Reading the system-wide menu file is always done.

							*-i*
-i {viminfo}	The file "viminfo" is used instead of the default viminfo
		file.  If the name "NONE" is used (all uppercase), no viminfo
		file is read or written, even if 'viminfo' is set or when
		":rv" or ":wv" are used.  See also |viminfo-file|.  {not in Vi}

							*-x*
-x		Use encryption to read/write files.  Will prompt for a key,
		which is then stored in the 'key' option.  All writes will
		then use this key to encrypt the text.  The '-x' argument is
		not needed when reading a file, because there is a check if
		the file that is being read has been encrypted, and Vim asks
		for a key automatically. |encryption|

							*-s*
-s {scriptin}	The script file "scriptin" is read.  The characters in the
		file are interpreted as if you had typed them.  The same can
		be done with the command ":source! {scriptin}".  If the end
		of the file is reached before the editor exits, further
		characters are read from the keyboard.  Only works when not
		started in Ex mode, see |-s-ex|.  See also |complex-repeat|.
		{not in Vi}

							*-w*
-w {scriptout}	All the characters that you type are recorded in the file
		"scriptout", until you exit Vim.  This is useful if you want
		to create a script file to be used with "vim -s" or
		":source!".  When the "scriptout" file already exists, new
		characters are appended.  See also |complex-repeat|.  {not in
		Vi}

							*-W*
-W {scriptout}	Like -w, but do not append, overwrite an existing file.  {not
		in Vi}

							*-w_nr*
-w{number}	Does nothing.  This was included for Vi-compatibility.  In Vi
		it sets the 'window' option, which is not implemented in Vim.

Example for using a script file to change a name in several files:
	Create a file "subs.vi" containing substitute commands and a :wq
	command:
>		:%s/Jones/Smith/g
>		:%s/Allen/Peter/g
>		:wq

	Execute Vim on all files you want to change:

>		foreach i ( *.let ) vim -s subs.vi $i

If the executable is called "view", Vim will start in Readonly mode.  This is
useful if you can make a hard or symbolic link from "view" to "vim".
Starting in Readonly mode can also be done with "vim -R".

If the executable is called "ex", Vim will start in "Ex" mode.  This means it
will accept only ":" commands.  But when the "-v" argument is given, Vim will
start in in Normal mode anyway.

==============================================================================
2. Vim on the Amiga					*starting-amiga*

Starting Vim from the Workbench				*workbench*
-------------------------------

Vim can be started from the Workbench by clicking on its icon twice.  It will
then start with an empty buffer.

Vim can be started to edit one or more files by using a "Project" icon.  The
"Default Tool" of the icon must be the full pathname of the Vim executable.
The name of the ".info" file must be the same as the name of the text file.
By clicking on this icon twice, Vim will be started with the file name as
current file name, which will be read into the buffer (if it exists).  You can
edit multiple files by pressing the shift key while clicking on icons, and
clicking twice on the last one.  The "Default Tool" for all these icons must
be the same.

It is not possible to give arguments to Vim, other than file names, from the
workbench.

Vim window						*amiga-window*
----------

Vim will run in the CLI window where it was started.  If Vim was started with
the "run" or "runback" command, or if Vim was started from the workbench, it
will open a window of its own.

Technical detail:
	To open the new window a little trick is used.  As soon as Vim
	recognizes that it does not run in a normal CLI window, it will
	create a script file in "t:".  This script file contains the same
	command as the one Vim was started with, and an "endcli" command.
	This script file is then executed with a "newcli" command (the "c:run"
	and "c:newcli" commands are required for this to work).  The script
	file will hang around until reboot, or until you delete it.  This
	method is required to get the ":sh" and ":!" commands to work
	correctly.  But when Vim was started with the -f option (foreground
	mode), this method is not used.  The reason for this is that
	when a program starts Vim with the -f option it will wait for Vim to
	exit.  With the script trick, the calling program does not know when
	Vim exits.  The -f option can be used when Vim is started by a mail
	program which also waits for the edit session to finish.  As a
	consequence, the ":sh" and ":!" commands are not available when the
	-f option is used.

Vim will automatically recognize the window size and react to window
resizing.  Under Amiga DOS 1.3, it is advised to use the fastfonts program,
"FF", to speed up display redrawing.

==============================================================================
3. Running Vim from xargs					*xargs*

The xargs program can be used to start a program with arguments that come from
stdin.  A typical example:

>	find . -name "*.c" -print | xargs vim

A problem is that stdin for the program run by xargs is not setup properly,
which causes problems for Vim.  That is because Vim expects commands to come
from stdin.  The symptoms are that typed characters are echoed and don't take
effect until <Return> is hit.

This is really a problem in xargs.  To work around it, you can use this small
program:

> #include <unistd.h>
> #include <stdio.h>
>
> main(argc, argv)
>     int    argc;
>     char   **argv;
> {
>     close(0);		/* close stdin */
>     dup(2);		/* duplicate stdin from stderr */
>     execvp(argv[1], argv + 1);
>     perror("could not execute program");
> }

Store this in "start.c", compile it to "start" and put it somewhere in your
search path.  You might have to make a few adjustments for your system.  An
example of using this:

>	find . -name "*.c" -print | xargs start vim

==============================================================================
4. Initialization				*initialization* *startup*

This section is about the non-GUI version of Vim.  See |gui-fork| for
additional initialization when starting the GUI.

At startup, Vim checks environment variables and files and sets values
accordingly.  Vim proceeds in this order:

1. Set the 'shell' option				*SHELL* *COMSPEC*
	The environment variable SHELL, if it exists, is used to set the
	'shell' option.  On MS-DOS and Win32, the COMPSPEC variable is used
	if SHELL is not set.

2. Set the 'term' option				*TERM*
	The environment variable TERM, if it exists, is used to set the 'term'
	option.

3. Execute Ex commands, from environment variables and/or files
	An environment variable is read as one Ex command line, where multiple
	commands must be separated with '|' or "<NL>".
								*vimrc* *exrc*
	A file that contains initialization commands is called a "vimrc" file.
	Each line in a vimrc file is executed as an Ex command line.  It is
	sometimes also referred to as "exrc" file.  They are the same type of
	file, but "exrc" is what Vi always used, "vimrc" is a Vim specific
	name.  Also see |vimrc-intro|.

	Recommended place for your personal initializations:
		Unix		    $HOME/.vimrc
		OS/2		    $HOME/.vimrc or $VIM/.vimrc (or _vimrc)
		MS-DOS and Win32    $HOME/_vimrc or $VIM/_vimrc
		Amiga		    s:.vimrc or $VIM/.vimrc

	If Vim was started with "-u filename", the file "filename" is used.
	All following initializations until 5. are skipped.
	"vim -u NONE" can be used to skip these initializations.  |-u|

	If Vim was started in Ex mode with the "-s" argument, all following
	initializations until 4. are skipped.  Only the "-u" option is
	interpreted.
     							*system-vimrc*
     a. For Unix, OS/2, VMS, Macintosh, RISC-OS and Amiga the system vimrc
	file is read for initializations.  The path of this file is shown with
	the ":version" command.  Note that this file is ALWAYS read in
	'compatible' mode, since the automatic resetting of 'compatible' is
	only done later.  Add a ":set nocp" command if you like.

			  *VIMINIT* *.vimrc* *_vimrc* *EXINIT* *.exrc* *_exrc*
     b. Four places are searched for initializations.  The first that exists
	is used, the others are ignored.
	-  The environment variable VIMINIT (see also |compatible-default|) (*)
	-  The user vimrc file(s):
		    "$HOME/.vimrc"	(for Unix and OS/2) (*)
		    "s:.vimrc"		(for Amiga) (*)
		    "home:.vimrc"	(for Amiga) (*)
		    "$VIM/.vimrc"	(for OS/2 and Amiga) (*)
		    "$HOME/_vimrc"	(for MS-DOS and Win32) (*)
		    "$VIM\_vimrc"	(for MS-DOS and Win32) (*)
		Note: For Unix, OS/2 and Amiga, when ".vimrc" does not exist,
		"_vimrc" is also tried, in case an MS-DOS compatible file
		system is used.  For MS-DOS and Win32 ".vimrc" is checked
		after "_vimrc", in case long file names are used.
		Note: For MS-DOS and Win32, "$HOME" is checked first.  If no
		"_vimrc" or ".vimrc" is found there, "$VIM" is tried.
		See |$VIM| for when $VIM is not set.
	-  The environment variable EXINIT
	-  The user exrc file(s).  Same as for the user vimrc file, but with
	   "vimrc" replaced by "exrc".  But without the (*)!

     c. If the 'exrc' option is on (which is not the default), the current
	directory is searched for four files.  The first that exists is used,
	the others are ignored.
	-  The file ".vimrc" (for Unix, Amiga and OS/2) (*)
		    "_vimrc" (for MS-DOS and Win32) (*)
	-  The file "_vimrc" (for Unix, Amiga and OS/2) (*)
		    ".vimrc" (for MS-DOS and Win32) (*)
	-  The file ".exrc"  (for Unix, Amiga and OS/2)
		    "_exrc"  (for MS-DOS and Win32)
	-  The file "_exrc"  (for Unix, Amiga and OS/2)
		    ".exrc"  (for MS-DOS and Win32)

     (*) Using this file or environment variable will cause 'compatible' to be
	 off by default.  See |compatible-default|.

4. Load the default file type detection script.
	This script is used to set autocommands for the FileType event.  See
	|FileType| and |'filetype'|.  This is only done if Vim was compiled
	with the |+autocmd| feature.
	If Vim was started with "-u filename", this is skipped.  |-u|
	The name of this file depends on the system:
		Amiga	    $VIMRUNTIME/filetype.vim
		Mac	    $VIMRUNTIME:filetype.vim
		MS-DOS	    $VIMRUNTIME\filetype.vim
		RiscOS	    Vim:Filetype
		Unix	    $VIMRUNTIME/filetype.vim
		VMS	    $VIMRUNTIME/filetype.vim

5. Set 'shellpipe' and 'shellredir'
	The 'shellpipe' and 'shellredir' options are set according to the
	value of the 'shell' option, unless they have been set before.
	This means that Vim will figure out the values of 'shellpipe' and
	'shellredir' for you, unless you have set them yourself.

6. Set 'updatecount' to zero, if "-n" command argument used

7. Set binary options
	If the "-b" flag was given to Vim, the options for binary editing will
	be set now.  See |-b|.

8. Perform GUI initializations
	Only when starting "gvim", the GUI initializations will be done.  See
	|gui-init|.

9. Read the viminfo file
	If the 'viminfo' option is not empty, the viminfo file is read.  The
	default is empty, so 'viminfo' must have been set by one of the
	previous initializations.  See |viminfo-file|.

10. Read the quickfix file
	If the "-q" flag was given to Vim, the quickfix file is read.  If this
	fails, Vim exits.

11. Open all windows
	When the |-o| flag was given, windows will be opened (but not
	displayed yet).
	When switching screens, it happens now.  Redrawing starts.
	If the "-q" flag was given to Vim, the first error is jumped to.
	Buffers for all windows will be loaded.

12. Execute startup commands
	If a "-t" flag was given to Vim, the tag is jumped to.
	The commands given with the |-c| and |+cmd| arguments are executed.
	If the 'insertmode' option is set, Insert mode is entered.
	The |VimEnter| autocommands are executed.

Some hints on using initializations:

Standard setup:
Create a vimrc file to set the default settings and mappings for all your edit
sessions.  Put it in a place so that it will be found by 3b:
	~/.vimrc	(Unix and OS/2)
	s:.vimrc	(Amiga)
	$VIM\_vimrc	(MS-DOS and Win32)
Note that creating a vimrc file will cause the 'compatible' option to be off
by default.  See |compatible-default|.

Local setup:
Put all commands that you need for editing a specific directory only into a
vimrc file and place it in that directory under the name ".vimrc" ("_vimrc"
for MS-DOS and Win32).  NOTE: To make Vim look for these special files you
have to turn on the option 'exrc'.  See |trojan-horse| too.

System setup:
This only applies if you are managing a Unix system with several users and
want to set the defaults for all users.  Create a vimrc file with commands
for default settings and mappings and put it in the place that is given with
the ":version" command.

Saving the current state of Vim to a file:
Whenever you have changed values of options or when you have created a
mapping, then you may want to save them in a vimrc file for later use.  See
|save-settings| about saving the current state of settings to a file.

Avoiding setup problems for Vi users:
Vi uses the variable EXINIT and the file "~/.exrc".  So if you do not want to
interfere with Vi, then use the variable VIMINIT and the file "vimrc" instead.

Amiga environment variables:
On the Amiga, two types of environment variables exist.  The ones set with the
DOS 1.3 (or later) setenv command are recognized.  See the AmigaDos 1.3
manual.  The environment variables set with the old Manx Set command (before
version 5.0) are not recognized.

MS-DOS line separators:
On MS-DOS-like systems (MS-DOS itself, Win32, and OS/2), Vim assumes that all
the vimrc files have <CR> <NL> pairs as line separators.  This will give
problems if you have a file with only <NL>s and have a line like
":map xx yy^M".  The trailing ^M will be ignored.

						     *compatible-default*
When Vim starts, the 'compatible' option is on.  This will be used when Vim
starts its initializations.  But as soon as a user vimrc file is found, or a
vimrc file in the current directory, or the "VIMINIT" environment variable is
set, it will be set to 'nocompatible'.  This has the side effect of setting or
resetting other options (see 'compatible').  But only the options that have
not been set or reset will be changed.  This has the same effect like the
value of 'compatible' had this value when starting Vim.  Note that this
doesn't happen for the system-wide vimrc file.

But there is a side effect of setting or resetting 'compatible' at the moment
a .vimrc file is found: Mappings are interpreted the moment they are
encountered.  This makes a difference when using things like "<CR>".  If the
mappings depend on a certain value of 'compatible', set or reset it before
giving the mapping.

The above behavior can be overridden in these ways:
- If the "-N" command line argument is given, 'nocompatible' will be used,
  even when no vimrc file exists.
- If the "-C" command line argument is given, 'compatible' will be used, even
  when a vimrc file exists.
- If the "-u {vimrc}" argument is used, 'compatible' will be used.
- When the name of the executable ends in "ex", then this works like the "-C"
  argument was given: 'compatible' will be used, even when a vimrc file
  exists.  This has been done to make Vim behave like "ex", when it is started
  as "ex".

Avoiding trojan horses:					*trojan-horse*
While reading the "vimrc" or the "exrc" file in the current directory, some
commands can be disabled for security reasons by setting the 'secure' option.
This is always done when executing the command from a tags file.  Otherwise it
would be possible that you accidentally use a vimrc or tags file that somebody
else created and contains nasty commands.  The disabled commands are the ones
that start a shell, the ones that write to a file, and ":autocmd".  The ":map"
commands are echoed, so you can see which keys are being mapped.
	If you want Vim to execute all commands in a local vimrc file, you
can reset the 'secure' option in the EXINIT or VIMINIT environment variable or
in the global "exrc" or "vimrc" file.  This is not possible in "vimrc" or
"exrc" in the current directory, for obvious reasons.
	On Unix systems, this only happens if you are not the owner of the
vimrc file.  Warning: If you unpack an archive that contains a vimrc or exrc
file, it will be owned by you.  You won't have the security protection.  Check
the vimrc file before you start Vim in that directory, or reset the 'exrc'
option.  Some Unix systems allow a user to do "chown" on a file.  This makes
it possible for another user to create a nasty vimrc and make you the owner.
Be careful!
	When using tag search commands, executing the search command (the last
part of the line in the tags file) is always done in secure mode.  This works
just like executing a command from a vimrc/exrc in the current directory.

							*slow-start*
If Vim takes a long time to start up, there may be a few causes:
- If the Unix version was compiled with the GUI and/or X11 (check the output
  of ":version" for "+GUI" and "+X11"), it may need to load shared libraries
  and connect to the X11 server.  Try compiling a version with GUI and X11
  disabled.  This also should make the executable smaller.
- If you have "viminfo" enabled, the loading of the viminfo file may take a
  while.  You can find out if this is the problem by disabling viminfo for a
  moment (use the Vim argument "-i NONE", |-i|).  Try reducing the number of
  lines stored in a register with ":set viminfo='20\"50".
							|viminfo-file|.

							*:intro*
When Vim starts without a file name, an introductory message is displayed (for
those who don't know what Vim is).  It is removed as soon as the display is
redrawn in any way.  To see the message again, use the ":intro" command.
To avoid the intro message on startup, add the 'I' flag to 'shortmess'.

==============================================================================
5. Suspending						*suspend*

						*iconise* *CTRL-Z* *v_CTRL-Z*
CTRL-Z			Suspend Vim, like ":stop".
			Works in Normal and in Visual mode.  In Insert and
			Command-line mode, the CTRL-Z is inserted as a normal
			character.


:sus[pend][!]	or			*:sus* *:suspend* *:st* *:stop*
:st[op][!]		Suspend Vim.
			If the '!' is not given and 'autowrite' is set, every
			buffer with changes and a file name is written out.
			If the '!' is given or 'autowrite' is not set, changed
			buffers are not written, don't forget to bring Vim
			back to the foreground later!

In the GUI, suspending is implemented as iconising gvim.  In Windows 95/NT,
gvim is minimized.

On many Unix systems, it is possible to suspend Vim with CTRL-Z.  This is only
possible in Normal and Visual mode (see next chapter, |vim-modes|).  Vim will
continue if you make it the foreground job again.  On other systems, CTRL-Z
will start a new shell.  This is the same as the ":sh" command.  Vim will
continue if you exit from the shell.

==============================================================================
6. The vimrc file			*vimrc-intro* *vim-script-intro*

A vimrc file can be used for settings you intend to use more-or-less for every
of your Vim sessions.  Normally the file is called $HOME/.vimrc, but other
files can also be used, see |vimrc|.  Vim will read it (them) when starting
and interpret the commands in them.

You can also use Vim script files for other purposes.  The files used for
syntax highlighting are an example.  There are enough commands in Vim to
accomplish just about any task.

						*vimrc_example.vim*
You should be able to find an example vimrc file at
$VIMRUNTIME/vimrc_example.vim.  You could use this as a start for your own
vimrc file.  You can also find a lot of examples in vimrc files made by
others.  Have a look at http://www.vim.org/user.html.


USING EX COMMANDS ~

The vimrc file can contain anything that can be typed on the Vim command line.
The recommended practice is not to include the preceding colon sign ":", thus
if one would type
>	:set number
on the Vim command line, the same can appear in the vimrc file simply as
>	set number

The end-of-line character depends on the system.  For Unix a single <NL>
character is used.  For MS-DOS, Windows, OS/2 and the like, <CR><LF> is used.
This is important when using mappings that end in a <CR>.  See |:source_crnl|.

Long lines can be split up by inserting a "\" (backslash) at the start of
the next line where the line has been broken, see |line-continuation|.
Example:
>	iabbr Http  Hyper Text Transfer
>		\ Protocol
Note that this only works in a Vim script file.


WHITE SPACE ~

Blank lines are allowed and ignored.

Leading whitespace characters (blanks and TABs) are always ignored.  The
whitespaces between parameters (e.g. between the 'set' and the 'number' in the
example above) are reduced to one blank character and plays the role of a
separator, the whitespaces after the last (visible) character may or may not
be ignored depending on the situation, see below.

For a ":set" command involving the "=" (equal) sign, such as in
>	set cpoptions    =aABceFst
the whitespace immediately before the "=" sign is ignored.  But there can be
no whitespace after the "=" sign!

To include a whitespace character in the value of an option, it must be
escaped by a "\" (backslash)  as in the following example:
>	set tags=my\ nice\ file
The same example written as
>	set tags=my nice file
will issue an error, because it is interpreted as:
>	set tags=my
>	set nice
>	set file


COMMENTS ~

The character " (the double quote mark) starts a comment.  Everything after
and including this character until the end-of-line is considered a comment and
is ignored, except for commands that don't consider comments, as shown in
examples below.  A comment can start on any character position on the line.

There is a little "catch" with comments for some commands.  Examples:
>	abbrev dev development		" shorthand
>	map <F3> o#include		" insert include
>	execute cmd			" do it
>	!ls *.c				" list C files
The abbreviation 'dev' will be expanded to 'development     " shorthand'.  The
mapping of <F3> will actually be the whole line after the 'o# ....' including
the '" insert include'.  The "execute" command will give an error.  The "!"
command will send everything after it to the shell, causing an error for an
unmatched '"' character.
There can be no comment after ":map", ":abbreviate", ":execute" and "!"
commands (there are a few more commands with this restriction).  For the
"map", ":abbreviate" and "execute" commands there is a trick:
>	abbrev dev development|" shorthand
>	map <F3> o#include|" insert include
>	execute cmd			|" do it
With the '|' character the command is separated from the next one.  And that
next command is only a comment.

Note that there is no white space before the '|' in the abbreviation and
mapping.  For these commands, any character until the end-of-line or '|' is
included.  As a consequence of this behavior, you don't always see that
trailing whitespace is included:
>	map <F4> o#include  
To avoid these problems, you can set the 'list' option when editing vimrc
files.


PITFALLS ~

Even bigger problem arises in the following example:
>	map ,ab o#include
>	unmap ,ab
Here the mapping of ,ab will be ',ab', no trailing whitespaces is included.
However, the "unmap" does not end directly with the end-of-line, Vim will try
to unmap ',ab ', which does not exist as a mapped sequence.  An error will be
issued, which is very hard to identify, because the ending whitespace
character on the 'unmap ,ab ' are not visible.

And this is exactly the same what happens when one uses a comment after an
'unmap' command:
>	unmap ,ab     " comment
Here the comment part will be ignored.  However, Vim will try to unmap
',ab     ', which does not exist,  Deleting the comment as well as all the
whitespaces up the ending 'b' character will cure the problem.

Except for the situations as above, it is legal to put a comment on the same
line as the Vim definitions, such as
>	set number	" display line numbers


NORMAL MODE COMMANDS ~

To execute normal mode commands, the |:normal| command can be used.  To avoid
trouble with special characters, use the |:execute| command.  Its argument is
an expression (more about that further down).  Example:
>	exe "normal mxGOA test.\<Esc>`x"
This appends "A test." below the last line in the file and returns the cursor
to where it was.  Note the use of "\<Esc>", which is translated into the
escape character.  To use a backslash or double quote here you have to put a
backslash before it:
>	exe "normal \"aYgg\"aP"
This yanks the current line and puts it above the first line in the file.  To
do this without changing the cursor position and the text displayed in the
window, this has to be extended a bit:
>	exe "normal ma\"aYHmbgg\"aP`bzt`a"
What this does:
	ma		set mark a at cursor position
	"aY		yank current line into register a
	Hmb		go to top line in window and set mark b there
	gg		go to first line in file
	"aP		put the yanked line above it
	`b		go back to top line in display
	zt		position the text in the window as it was before
	`a		go back to saved cursor position


IF - ELSE - ENDIF ~

Sometimes you will want to execute a command only under a certain condition.
The |:if| command can be used for this.  Example:
>	if &term == "xterm"
>	  echo "this is an xterm"
>	endif
The argument for the "if" command is an expression.  If this expression
evaluates to true (non-zero), the statements until the "endif" are executed.
If the expression evaluates to zero, these commands are skipped.
The |:echo| command prints its argument, which is also an expression.

Many constructions can be used in an expression.  In the example we see this:
	&term		The value of the 'term' option.  A name prepended with
			'&' is the value of the option by that name.
	==		"equal", compares the strings or numbers on each
			side, and evaluates to true when they are equal.
	"xterm"		A literal string.
For more information about expressions, see |expression|.

You can also use "else":
>	if &tabstop != 8
>	  echo "tabstop is " . &tabstop
>	else
>	  echo "tabstop is OK"
>	endif
Note that a dot is used in the first echo command, to concatenate the literal
string with the value of the 'tabstop' option.  It is automatically converted
from a number to a string, so that it can be concatenated.


WHILE - ENDWHILE ~

To repeat a sequence of commands the |:while| command can be used:
>	let i = 1
>	while i < 10
>	  echo i
>	  let i = i + 1
>	endwhile
This uses the internal variable "i".  An internal variable is used just like
in many programming languages.  The |:let| command is used to assign a value
to a variable.  The variable need not be declared and can hold a number or a
string.
The statements between the "while" and the "endwhile" are executed nine times.
Note that the variable "i" is incremented with the "let i = i + 1" command.
If you would forget this, the loop would run forever!  Fortunately you can
interrupt it with a CTRL-C (CTRL-Break on DOS).


BUILTIN FUNCTIONS ~

Vim has builtin functions that you can use.  Example:
>	echo exists("did_my_inits")
This will print a one when the variable "did_my_inits" exists, and a zero if
it doesn't exist.
>	if has("gui_running")
>	  syntax on
>	endif
This will switch on syntax highlighting if the GUI is started.  The has()
function can be used to check if a certain feature is supported.
>	call append(0, hostname() . " - " . strftime("%Y %b %d"))
This inserts a line with the name of the computer and the current date at the
start of the current buffer.

There are many more functions, which can be used to accomplish most things you
would want to do in Vim, which are too complicated to do with normal commands.
See |functions|.


USER DEFINED FUNCTIONS ~

You will often have a number of commands that you use in several places.  You
can define a function for these, and call it where you want.  Example:
>	function My_Func(name)
>	  if a:name ==? "john"
>	    let s = "Hello "
>	  else
>	    let s = "I don't know "
>	  endif
>	  echo s . a:name . "."
>	endfun
Explanation:
The function "My_Func" is defined with one argument.  "a:name" is used to
refer to that argument.  The "==?" operator is used to compare the argument
with "john" while ignoring case.  You could call it like this:
>	call My_Func("John")
>	Hello John.
>	call My_Func("James")
>	I don't know James.

Note that the name of a user function always starts with a capital letter.
There can be any number of arguments.  See |:function|.


PACKAGING ~

To avoid your function names to interfere with functions that you get from
others, use this scheme:
- Prepend a unique string before each function name.  I often use an
  abbreviation.  For example, "OW_" is used for the option window functions.
- Put the definition of your functions together in a file.  Set a global
  variable to indicate that the functions have been loaded.  When sourcing the
  file again, first unload the functions.
Example:
>	" This is the XXX package
>
>	if exists("XXX_loaded")
>	  delfun XXX_one
>	  delfun XXX_two
>	endif
>
>	function XXX_one(a)
>		... body of function ...
>	endfun
>
>	function XXX_two(b)
>		... body of function ...
>	endfun
>
>	let XXX_loaded = 1


AUTOCOMMANDS ~

You might want to set options or define mappings when editing a certain kind
of file.  Fortunatly, Vim already recognizes a lot of file types.  This is
used for syntax highlighting, but you can use it for other things too.  You
need to have syntax enabled |:syn-on|, or use this command:
>	filetype on

For example, this autocommand sets the 'cindent' option in a C program file:
>	au  FileType  c  set cindent
This autocommand consists of three parts:
	FileType	the name of the event which is used
	c		the name of the file type detected
	set cindent	the command executed when the event happens and the
			file type is "c"
See |:autocmd| for more information.

This works fine for the 'cindent' option, which is local to a buffer.  When
this is used for defining a mapping, this will not work properly when there
are two windows.  For example, if you are editing foo.txt in one window and
foo.c in another, a mapping defined for foo.c will also be used in foo.txt.
To make the mapping only work in the foo.c file, it needs to be removed as
soon as the foo.c file is no longer the current buffer.  That can be done in
this way:
>	au BufEnter * if &ft == "c" | call CM_map() | endif
>	au BufLeave * if &ft == "c" | call CM_unmap() | endif
>	fun CM_map()
>	  set cindent
>	  imap { {<CR> <BS><CR>}<Up><End>
>	endfun
>	fun CM_unmap()
>	  iunmap {
>	endfun
One function is used here to define the mapping and another to remove it.
This makes it possible to add more mappings, without changing the
autocommands.
The use of functions makes it possible to keep the autocommands short.  With
the '|' character commands are separated.
In the ":imap" command the <> codes are used to avoid the need for control
characters.  This is easy to type and to read back.  The " <BS> is used to
avoid that the indent is removed when <CR> is typed.

==============================================================================
7. The viminfo file					*viminfo-file*

If you exit Vim and later start it again, you would normally lose a lot of
information.  The viminfo file can be used to remember that information, which
enables you to continue where you left off.

The viminfo file is used to store:
- The command line history.
- The search string history.
- The input-line history.
- Contents of registers.
- Marks for several files.
- File marks, pointing to locations in files.
- Last search/substitute pattern (for 'n' and '&').
- The buffer list.
- Global variables.

The viminfo file is not supported when the |+viminfo| feature has been
disabled at compile time.

You could also use a session file.  The difference is that the viminfo file
does not depend on what you are working on.  There normally is only one
viminfo file.  Session files are used to save the state of a specific editing
session.  You could have several session files, one for each project you are
working on.  Viminfo and session files together can be used to effectively
enter Vim and directly start working in your desired setup. |session-file|

							*viminfo-read*
When Vim is started and the 'viminfo' option is non-empty, the contents of
the viminfo file are read and the info can be used in the appropriate places.
The marks are not read in at startup (but file marks are).  See
|initialization| for how to set the 'viminfo' option upon startup.

							*viminfo-write*
When Vim exits and 'viminfo' is non-empty, the info is stored in the viminfo
file (it's actually merged with the existing one, if one exists).  The
'viminfo' option is a string containing information about what info should be
stored, and contains limits on how much should be stored (see 'viminfo').

Notes for Unix:
- The file protection for the viminfo file will be set to prevent other users
  from being able to read it, because it may contain any text or commands that
  you have worked with.
- If you want to share the viminfo file with other users (e.g. when you "su"
  to another user), you can make the file writable for the group or everybody.
  Vim will preserve this when writing new viminfo files.  Be careful, don't
  allow just anybody to read and write your viminfo file!
- Vim will not overwrite a viminfo file that is not writable by the current
  "real" user.  This helps for when you did "su" to become root, but your
  $HOME is still set to a normal user's home directory.  Otherwise Vim would
  create a viminfo file owned by root that nobody else can read.

Marks are stored for each file separately.  When a file is read and 'viminfo'
is non-empty, the marks for that file are read from the viminfo file.  NOTE:
The marks are only written when exiting Vim, which is fine because marks are
remembered for all the files you have opened in the current editing session,
unless ":bdel" is used.  If you want to save the marks for a file that you are
about to abandon with ":bdel", use ":wv".  The '[' and ']' marks are not
stored, but the '"' mark is.  The '"' mark is very useful for jumping to the
cursor position when the file was last exited.  No marks are saved for files
that start with any string given with the "r" flag in 'viminfo'.  This can be
used to avoid saving marks for files on removable media (for MS-DOS you would
use "ra:,rb:", for Amiga "rdf0:,rdf1:,rdf2:").

							*viminfo-file-marks*
Uppercase marks ('A to 'Z) are stored when writing the viminfo file.  The
numbered marks ('0 to '9) are a bit special.  When the viminfo file is written
(when exiting or with the ":wviminfo" command), '0 is set to the current cursor
position and file.  The old '0 is moved to '1, '1 to '2, etc.  This
resembles what happens with the "1 to "9 delete registers.  If the current
cursor position is already present in '0 to '9, it is moved to '0, to avoid
having the same position twice.  The result is that with "'0", you can jump
back to the file and line where you exited Vim.  To do that right away, try
using this command:

>	vim -c "normal '0"

In (c)sh, you could make an alias for it:

>	alias lvim vim -c '"'normal "'"0'"'

Viminfo file name:					*viminfo-file-name*
- The default name of the viminfo file is "$HOME/.viminfo" for Unix and OS/2,
  "s:.viminfo" for Amiga, "$HOME\_viminfo" for MS-DOS and Win32.  For the last
  two, when $HOME is not set, "$VIM\_viminfo" is used.  When $VIM is also not
  set, "c:\_viminfo" is used.  For OS/2 "$VIM/.viminfo" is used when $HOME is
  not set and $VIM is set.
- The 'n' flag in the 'viminfo' option can be used to specify another viminfo
  file name |'viminfo'|.
- The "-i" Vim argument can be used to set another file name, |-i|.  When the
  file name given is "NONE" (all uppercase), no viminfo file is ever read or
  written.  Also not for the commands below!
- For the commands below, another file name can be given, overriding the
  default and the name given with 'viminfo' or "-i" (unless it's NONE).

Two commands can be used to read and write the viminfo file manually.  This
can be used to exchange registers between two running Vim programs: First
type ":wv" in one and then ":rv" in the other.  Note that if the register
already contained something, then ":rv!" would be required.  Also note
however that this means everything will be overwritten with information from
the first Vim, including the command line history, etc.

The viminfo file itself can be edited by hand too, although we suggest you
start with an existing one to get the format right.  It is reasonably
self-explanatory once you're in there.  This can be useful in order to
create a second file, say "~/.my_viminfo" which could contain certain
settings that you always want when you first start Vim.  For example, you
can preload registers with particular data, or put certain commands in the
command line history.  A line in your .vimrc file like
>	rviminfo! ~/.my_viminfo
can be used to load this information.  You could even have different viminfos
for different types of files (e.g., C code) and load them based on the file
name, using the ":autocmd" command (see |:autocmd|).

							*viminfo-errors*
When Vim detects an error while reading a viminfo file, it will not overwrite
that file.  If there are more than 10 errors, Vim stops reading the viminfo
file.  This was done to avoid accidentally destroying a file when the file
name of the viminfo file is wrong.  This could happen when accidentally typing
"vim -i file" when you wanted "vim -R file" (yes, somebody accidentally did
that!).  If you want to overwrite a viminfo file with an error in it, you will
either have to fix the error, or delete the file (while Vim is running, so
most of the information will be restored).

						   *:rv* *:rviminfo*
:rv[iminfo][!] [file]	Read from viminfo file [file] (default: see above).
			If [!] is given, then any information that is
			already set (registers, marks, etc.) will be
			overwritten.  {not in Vi}

						   *:wv* *:wviminfo*
:wv[iminfo][!] [file]	Write to viminfo file [file] (default: see above).
			The information in the file is first read in to make
			a merge between old and new info.  When [!] is used,
			the old information is not read first, only the
			internal info is written.  If 'viminfo' is empty, marks
			for up to 100 files will be written.  {not in Vi}

 vim:tw=78:ts=8:sw=8:
