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Emacs normally does not save backup files for source files
that are maintained with version control. If you want to make
backup files even for files that use version control, set the
variable vc-make-backup-files to a
non-nil value.
Editing a version-controlled file through a symbolic link may
cause unexpected results, if you are unaware that the underlying
file is version-controlled. The variable
vc-follow-symlinks controls what Emacs does if you
try to visit a symbolic link pointing to a version-controlled
file. If the value is ask (the default), Emacs asks
for confirmation. If it is nil, Emacs just displays
a warning message. If it is t, Emacs automatically
follows the link and visits the real file instead.
If vc-suppress-confirm is non-nil,
then C-x v v and C-x v i can save the
current buffer without asking, and C-x v u also
operates without asking for confirmation.
VC mode does much of its work by running the shell commands
for the appropriate version control system. If
vc-command-messages is non-nil, VC
displays messages to indicate which shell commands it runs, and
additional messages when the commands finish.