Recovering Data from Auto-Saves
You can use the contents of an auto-save file to recover from a loss
of data with the command M-x recover-file <RET> file
<RET>. This visits file and then (after your confirmation)
restores the contents from its auto-save file #file#.
You can then save with C-x C-s to put the recovered text into
file itself. For example, to recover file foo.c from its
auto-save file #foo.c#, do:
M-x recover-file <RET> foo.c <RET>
yes <RET>
C-x C-s
Before asking for confirmation, M-x recover-file displays a
directory listing describing the specified file and the auto-save file,
so you can compare their sizes and dates. If the auto-save file
is older, M-x recover-file does not offer to read it.
If Emacs or the computer crashes, you can recover all the files you
were editing from their auto save files with the command M-x
recover-session. This first shows you a list of recorded interrupted
sessions. Move point to the one you choose, and type C-c C-c.
Then recover-session asks about each of the files that were
being edited during that session, asking whether to recover that file.
If you answer y, it calls recover-file, which works in its
normal fashion. It shows the dates of the original file and its
auto-save file, and asks once again whether to recover that file.
When recover-session is done, the files you've chosen to
recover are present in Emacs buffers. You should then save them. Only
this--saving them--updates the files themselves.
Emacs records interrupted sessions for later recovery in files named
~/.emacs.d/auto-save-list/.saves-pid-hostname. The
~/.emacs.d/auto-save-list/.saves- portion of these names comes
from the value of auto-save-list-file-prefix. You can record
sessions in a different place by customizing that variable. If you
set auto-save-list-file-prefix to nil in your
.emacs file, sessions are not recorded for recovery.
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