elvrec - Recover the modified version of a file after a crash
elvrec [preservedfile [newfile]]
If you're editing a file when elvis dies, the system crashes, or power
fails, the most recent version of your text will be preserved. The
preserved text is stored in a special directory; it does NOT overwrite
your text file automatically.
The elvrec program locates the preserved version of a given file, and
writes it over the top of your text file -- or to a new file, if you
prefer. The recovered file will have nearly all of your changes.
To see a list of all recoverable files, run elvrec with no arguments.
The text that was preserved when elvis died.
A text file which lists the names of all preserved files, and the
names of the /usr/preserve/p* files which contain their preserved
elvrec is very picky about filenames. You must tell it to recover the
file using exactly the same pathname as when you were editing it. The
simplest way to do this is to go into the same directory that you were
editing, and invoke elvrec with the same filename as elvis. If that
doesn't work, then try running elvrec with no arguments, to see exactly
which pathname it is using for the desired file.
Due to the permissions on the /usr/preserve directory, on UNIX systems
elvrec must be run as superuser. This is accomplished by making the
elvrec executable be owned by "root" and setting its "set user id" bit.
If you're editing a nameless buffer when elvis dies, then elvrec will
pretend that the file was named "foo".