GNU Emacs Manual - VC Mode Line

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### Version Control and the Mode Line

When you visit a file that is under version control, Emacs indicates this on the mode line. For example, ``RCS-1.3'` says that RCS is used for that file, and the current version is 1.3.

The character between the back-end name and the version number indicates the version control status of the file. ``-'` means that the work file is not locked (if locking is in use), or not modified (if locking is not in use). ``:'` indicates that the file is locked, or that it is modified. If the file is locked by some other user (for instance, ``jim'`), that is displayed as ``RCS:jim:1.3'`.

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