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- *recover.txt* For Vim version 6.0. Last change: 2001 Sep 03
-
-
- VIM REFERENCE MANUAL by Bram Moolenaar
-
-
- Recovery after a crash *crash-recovery*
-
- You have spent several hours typing in that text that has to be finished
- next morning, and then disaster strikes: Your computer crashes.
-
- DON'T PANIC!
-
- You can recover most of your changes from the files that Vim uses to store
- the contents of the file. Mostly you can recover your work with one command:
- vim -r filename
-
- 1. The swap file |swap-file|
- 2. Recovery |recovery|
-
- ==============================================================================
- 1. The swap file *swap-file*
-
- Vim stores the things you changed in a swap file. Using the original file
- you started from plus the swap file you can mostly recover your work.
-
- You can see the name of the current swap file being used with the command:
-
- :sw[apname] *:sw* *:swapname*
-
- The name of the swap file is normally the same as the file you are editing,
- with the extension ".swp".
- - On Unix, a '.' is prepended to swap file names in the same directory as the
- edited file. This avoids that the swap file shows up in a directory
- listing.
- - On MS-DOS machines and when the 'shortname' option is on, any '.' in the
- original file name is replaced with '_'.
- - If this file already exists (e.g., when you are recovering from a crash) a
- warning is given and another extension is used, ".swo", ".swn", etc.
- - An existing file will never be overwritten.
- - The swap file is deleted as soon as Vim stops editing the file.
-
- Technical: The replacement of '.' with '_' is done to avoid problems with
- MS-DOS compatible filesystems (e.g., crossdos, multidos). If Vim
- is able to detect that the file is on an MS-DOS-like filesystem, a
- flag is set that has the same effect as the 'shortname' option.
- This flag is reset when you start editing another file.
- *E326*
- If the ".swp" file name already exists, the last character is
- decremented until there is no file with that name or ".saa" is
- reached. In the last case, no swap file is created.
-
- By setting the 'directory' option you can place the swap file in another place
- than where the edited file is.
- Advantages:
- - You will not pollute the directories with ".swp" files.
- - When the 'directory' is on another partition, reduce the risk of damaging
- the file system where the file is (in a crash).
- Disadvantages:
- - You can get name collisions from files with the same name but in different
- directories (although Vim tries to avoid that by comparing the path name).
- This will result in bogus ATTENTION warning messages.
- - When you use your home directory, and somebody else tries to edit the same
- file, he will not see your swap file and will not get the ATTENTION waring
- message.
- On the Amiga you can also use a recoverable ram disk, but there is no 100%
- guarantee that this works. Putting swap files in a normal ram disk (like RAM:
- on the Amiga) or in a place that is cleared when rebooting (like /tmp on Unix)
- makes no sense, you will lose the swap file in a crash.
-
- If you want to put swap files in a fixed place, put a command resembling the
- following ones in your .vimrc:
- :set dir=dh2:tmp (for Amiga)
- :set dir=~/tmp (for Unix)
- :set dir=c:\\tmp (for MS-DOS and Win32)
- This is also very handy when editing files on floppy. Of course you will have
- to create that "tmp" directory for this to work!
-
- For read-only files, a swap file is not used. Unless the file is big, causing
- the amount of memory used to be higher than given with 'maxmem' or
- 'maxmemtot'. And when making a change to a read-only file, the swap file is
- created anyway.
-
- The 'swapfile' option can be reset to avoid creating a swapfile.
-
-
- Detecting an existing swap file ~
-
- You can find this in the user manual, section |11.3|.
-
-
- Updating the swapfile ~
-
- The swap file is updated after typing 200 characters or when you have not
- typed anything for four seconds. This only happens if the buffer was
- changed, not when you only moved around. The reason why it is not kept up to
- date all the time is that this would slow down normal work too much. You can
- change the 200 character count with the 'updatecount' option. You can set
- the time with the 'updatetime' option. The time is given in milliseconds.
- After writing to the swap file Vim syncs the file to disk. This takes some
- time, especially on busy Unix systems. If you don't want this you can set the
- 'swapsync' option to an empty string. The risk of losing work becomes bigger
- though. On some non-Unix systems (MS-DOS, Amiga) the swap file won't be
- written at all.
-
- If the writing to the swap file is not wanted, it can be switched off by
- setting the 'updatecount' option to 0. The same is done when starting Vim
- with the "-n" option. Writing can be switched back on by setting the
- 'updatecount' option to non-zero. Swap files will be created for all buffers
- when doing this. But when setting 'updatecount' to zero, the existing swap
- files will not be removed, it will only affect files that will be opened
- after this.
-
- If you want to make sure that your changes are in the swap file use this
- command:
-
- *:pre* *:preserve* *E313* *E314*
- :pre[serve] Write all text for all buffers into swap file. The
- original file is no longer needed for recovery. {Vi:
- emergency exit}
-
- A Vim swap file can be recognized by the first six characters: "b0VIM ".
- After that comes the version number, e.g., "3.0".
-
- ==============================================================================
- 2. Recovery *recovery* *E308* *E311*
-
- Basic file recovery is explained in the user manual: |usr_11.txt|.
-
- Another way to do recovery is to start Vim and use the ":recover" command.
- This is easy when you start Vim to edit a file and you get the "ATTENTION:
- Found a swap file ..." message. In this case the single command ":recover"
- will do the work. You can also give the name of the file or the swap file to
- the recover command:
- *:rec* *:recover* *E305* *E306* *E307*
- :rec[over] [file] Try to recover [file] from the swap file. If [file]
- is not given use the file name for the current
- buffer. The current contents of the buffer are lost.
- This command fails if the buffer was modified.
-
- :rec[over]! [file] Like ":recover", but any changes in the current
- buffer are lost.
-
- *E312* *E309* *E310*
- Vim has some intelligence about what to do if the swap file is corrupt in
- some way. If Vim has doubt about what it found, it will give an error
- message and insert lines with "???" in the text. If you see an error message
- while recovering, search in the file for "???" to see what is wrong. You may
- want to cut and paste to get the text you need.
-
- Be sure that the recovery was successful before overwriting the original
- file or deleting the swap file. It is good practice to write the recovered
- file elsewhere and run 'diff' to find out if the changes you want are in the
- recovered file.
-
- Once you are sure the recovery is ok delete the swap file. Otherwise, you
- will continue to get warning messages that the ".swp" file already exists.
-
- {Vi: recovers in another way and sends mail if there is something to recover}
-
- vim:tw=78:ts=8:ft=help:norl:
-