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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.
Normally the work file exists all the time, whether it is locked or
not. If you set vc-keep-workfiles to nil, then checking
in a new version with C-x C-q deletes the work file; but any
attempt to visit the file with Emacs creates it again. (With CVS, work
files are always kept.)
Editing a version-controlled file through a symbolic link can be dangerous. It bypasses the version control system--you can edit the file without locking it, and fail to check your changes in. Also, your changes might overwrite those of another user. To protect against this, VC checks each symbolic link that you visit, to see if it points to a file under version control.
The variable vc-follow-symlinks controls what to do when a
symbolic link points to a version-controlled file. If it is nil,
VC only displays a warning message. If it is t, VC automatically
follows the link, and visits the real file instead, telling you about
this in the echo area. If the value is ask (the default), VC
asks you each time whether to follow the link.
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