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+*usr_11.txt*	For Vim version 7.0aa.  Last change: 2004 Apr 23
+
+		     VIM USER MANUAL - by Bram Moolenaar
+
+			   Recovering from a crash
+
+
+Did your computer crash?  And you just spent hours editing?  Don't panic!  Vim
+keeps enough information on harddisk to be able to restore most of your work.
+This chapter shows you how to get your work back and explains how the swap
+file is used.
+
+|11.1|	Basic recovery
+|11.2|	Where is the swap file?
+|11.3|	Crashed or not?
+|11.4|	Further reading
+
+     Next chapter: |usr_12.txt|  Clever tricks
+ Previous chapter: |usr_10.txt|  Making big changes
+Table of contents: |usr_toc.txt|
+
+==============================================================================
+*11.1*	Basic recovery
+
+In most cases recovering a file is quite simple, assuming you know which file
+you were editing (and the harddisk is still working).  Start Vim on the file,
+with the "-r" argument added: >
+
+	vim -r help.txt
+
+Vim will read the swap file (used to store text you were editing) and may read
+bits and pieces of the original file.  If all is well, you will see these
+messages (with different file names, of course):
+
+	Using swap file ".help.txt.swp" ~
+	Original file "~/vim/runtime/doc/help.txt" ~
+	Recovery completed. You should check if everything is OK. ~
+	(You might want to write out this file under another name ~
+	and run diff with the original file to check for changes) ~
+	Delete the .swp file afterwards. ~
+
+To be on the safe side, write this file under another name: >
+
+	:write help.txt.recovered
+
+Compare the file with the original file to check if you ended up with what you
+expected.  Vimdiff is very useful for this |08.7|.  Watch out for the original
+file to contain a more recent version (you saved the file just before the
+computer crashed).  And check that no lines are missing (something went wrong
+that Vim could not recover).
+   If Vim produces warning messages when recovering, read them carefully.
+This is rare though.
+
+It's normal that the last few changes can not be recovered.  Vim flushes the
+changes to disk when you don't type for about four seconds, or after typing
+about two hundred characters.  This is set with the 'updatetime' and
+'updatecount' options.  Thus when Vim didn't get a chance to save itself when
+the system went down, the changes after the last flush will be lost.
+
+If you were editing without a file name, give an empty string as argument: >
+
+	vim -r ""
+
+You must be in the right directory, otherwise Vim can't find the swap file.
+
+==============================================================================
+*11.2*	Where is the swap file?
+
+Vim can store the swap file in several places.  Normally it is in the same
+directory as the original file.  To find it, change to the directory of the
+file, and use: >
+
+	vim -r
+
+Vim will list the swap files that it can find.  It will also look in other
+directories where the swap file for files in the current directory may be
+located.  It will not find swap files in any other directories though, it
+doesn't search the directory tree.
+   The output could look like this:
+
+	Swap files found: ~
+	   In current directory: ~
+	1.    .main.c.swp ~
+		  owned by: mool   dated: Tue May 29 21:00:25 2001 ~
+		 file name: ~mool/vim/vim6/src/main.c ~
+		  modified: YES ~
+		 user name: mool   host name: masaka.moolenaar.net ~
+		process ID: 12525 ~
+	   In directory ~/tmp: ~
+	      -- none -- ~
+	   In directory /var/tmp: ~
+	      -- none -- ~
+	   In directory /tmp: ~
+	      -- none -- ~
+
+If there are several swap files that look like they may be the one you want to
+use, a list is given of these swap files and you are requested to enter the
+number of the one you want to use.  Carefully look at the dates to decide
+which one you want to use.
+   In case you don't know which one to use, just try them one by one and check
+the resulting files if they are what you expected.
+
+
+USING A SPECIFIC SWAP FILE
+
+If you know which swap file needs to be used, you can recover by giving the
+swap file name.  Vim will then finds out the name of the original file from
+the swap file.
+
+Example: >
+	vim -r .help.txt.swo
+
+This is also handy when the swap file is in another directory than expected.
+If this still does not work, see what file names Vim reports and rename the
+files accordingly.  Check the 'directory' option to see where Vim may have
+put the swap file.
+
+	Note:
+	Vim tries to find the swap file by searching the directories in the
+	'dir' option, looking for files that match "filename.sw?".  If
+	wildcard expansion doesn't work (e.g., when the 'shell' option is
+	invalid), Vim does a desperate try to find the file "filename.swp".
+	If that fails too, you will have to give the name of the swapfile
+	itself to be able to recover the file.
+
+==============================================================================
+*11.3*	Crashed or not?					*ATTENTION* *E325*
+
+Vim tries to protect you from doing stupid things.  Suppose you innocently
+start editing a file, expecting the contents of the file to show up.  Instead,
+Vim produces a very long message:
+
+		E325: ATTENTION ~
+	Found a swap file by the name ".main.c.swp" ~
+		  owned by: mool   dated: Tue May 29 21:09:28 2001 ~
+		 file name: ~mool/vim/vim6/src/main.c ~
+		  modified: no ~
+		 user name: mool   host name: masaka.moolenaar.net ~
+		process ID: 12559 (still running) ~
+	While opening file "main.c" ~
+		     dated: Tue May 29 19:46:12 2001 ~
+ ~
+	(1) Another program may be editing the same file. ~
+	    If this is the case, be careful not to end up with two ~
+	    different instances of the same file when making changes. ~
+	    Quit, or continue with caution. ~
+ ~
+	(2) An edit session for this file crashed. ~
+	    If this is the case, use ":recover" or "vim -r main.c" ~
+	    to recover the changes (see ":help recovery"). ~
+	    If you did this already, delete the swap file ".main.c.swp" ~
+	    to avoid this message. ~
+
+You get this message, because, when starting to edit a file, Vim checks if a
+swap file already exists for that file.  If there is one, there must be
+something wrong.  It may be one of these two situations.
+
+1. Another edit session is active on this file.  Look in the message for the
+   line with "process ID".  It might look like this:
+
+		process ID: 12559 (still running) ~
+
+   The text "(still running)" indicates that the process editing this file
+   runs on the same computer.  When working on a non-Unix system you will not
+   get this extra hint.  When editing a file over a network, you may not see
+   the hint, because the process might be running on another computer.  In
+   those two cases you must find out what the situation is yourself.
+      If there is another Vim editing the same file, continuing to edit will
+   result in two versions of the same file.  The one that is written last will
+   overwrite the other one, resulting in loss of changes.  You better quit
+   this Vim.
+
+2. The swap file might be the result from a previous crash of Vim or the
+   computer.  Check the dates mentioned in the message.  If the date of the
+   swap file is newer than the file you were editing, and this line appears:
+
+		modified: YES ~
+
+   Then you very likely have a crashed edit session that is worth recovering.
+      If the date of the file is newer than the date of the swap file, then
+   either it was changed after the crash (perhaps you recovered it earlier,
+   but didn't delete the swap file?), or else the file was saved before the
+   crash but after the last write of the swap file (then you're lucky: you
+   don't even need that old swap file). Vim will warn you for this with this
+   extra line:
+
+      NEWER than swap file! ~
+
+
+UNREADABLE SWAP FILE
+
+Sometimes the line
+
+	[cannot be read] ~
+
+will appear under the name of the swap file. This can be good or bad,
+depending on circumstances.
+
+It is good if a previous editing session crashed without having made any
+changes to the file. Then a directory listing of the swap file will show
+that it has zero bytes. You may delete it and proceed.
+
+It is slightly bad if you don't have read permission for the swap file. You
+may want to view the file read-only, or quit. On multi-user systems, if you
+yourself did the last changes under a different login name, a logout
+followed by a login under that other name might cure the "read error". Or
+else you might want to find out who last edited (or is editing) the file and
+have a talk with them.
+
+It is very bad if it means there is a physical read error on the disk
+containing the swap file.  Fortunately, this almost never happens.
+You may want to view the file read-only at first (if you can), to see the
+extent of the changes that were "forgotten".  If you are the one in charge of
+that file, be prepared to redo your last changes.
+
+
+WHAT TO DO?
+
+If dialogs are supported you will be asked to select one of five choices:
+
+  Swap file ".main.c.swp" already exists! ~
+  [O]pen Read-Only, (E)dit anyway, (R)ecover, (Q)uit, (A)bort, (D)elete it: ~
+
+O  Open the file readonly.  Use this when you just want to view the file and
+   don't need to recover it.  You might want to use this when you know someone
+   else is editing the file, but you just want to look in it and not make
+   changes.
+
+E  Edit the file anyway.  Use this with caution!  If the file is being edited
+   in another Vim, you might end up with two versions of the file.  Vim will
+   try to warn you when this happens, but better be safe then sorry.
+
+R  Recover the file from the swap file.  Use this if you know that the swap
+   file contains changes that you want to recover.
+
+Q  Quit.  This avoids starting to edit the file.  Use this if there is another
+   Vim editing the same file.
+      When you just started Vim, this will exit Vim.  When starting Vim with
+   files in several windows, Vim quits only if there is a swap file for the
+   first one.  When using an edit command, the file will not be loaded and you
+   are taken back to the previously edited file.
+
+A  Abort.  Like Quit, but also abort further commands.  This is useful when
+   loading a script that edits several files, such as a session with multiple
+   windows.
+
+D  Delete the swap file.  Use this when you are sure you no longer need it.
+   For example, when it doesn't contain changes, or when the file itself is
+   newer than the swap file.
+      On Unix this choice is only offered when the process that created the
+   swap file does not appear to be running.
+
+If you do not get the dialog (you are running a version of Vim that does not
+support it), you will have to do it manually.  To recover the file, use this
+command: >
+
+	:recover
+
+
+Vim cannot always detect that a swap file already exists for a file.  This is
+the case when the other edit session puts the swap files in another directory
+or when the path name for the file is different when editing it on different
+machines.  Therefore, don't rely on Vim always warning you.
+
+If you really don't want to see this message, you can add the 'A' flag to the
+'shortmess' option.  But it's very unusual that you need this.
+
+==============================================================================
+*11.4*	Further reading
+
+|swap-file|	An explanation about where the swap file will be created and
+		what its name is.
+|:preserve|	Manually flushing the swap file to disk.
+|:swapname|	See the name of the swap file for the current file.
+'updatecount'	Number of key strokes after which the swap file is flushed to
+		disk.
+'updatetime'	Timeout after which the swap file is flushed to disk.
+'swapsync'	Whether the disk is synced when the swap file is flushed.
+'directory'	List of directory names where to store the swap file.
+'maxmem'	Limit for memory usage before writing text to the swap file.
+'maxmemtot'	Same, but for all files in total.
+
+==============================================================================
+
+Next chapter: |usr_12.txt|  Clever tricks
+
+Copyright: see |manual-copyright|  vim:tw=78:ts=8:ft=help:norl: