(emacs)Old Versions

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Examining And Comparing Old Versions

     Examine version VERSION of the visited file, in a buffer of its
     own (`vc-version-other-window').

`C-x v ='
     Compare the current buffer contents with the latest checked-in
     version of the file.

     Compare the specified two versions of FILE.

   You can examine any version of a file by first visiting it, and then
using `C-x v ~ VERSION RET' (`vc-version-other-window').  This puts the
text of version VERSION in a file named `FILENAME.~VERSION~', then
visits it in a separate window.

   To compare two versions of a file, use the command `C-x v ='

   Plain `C-x v =' compares the current buffer contents (saving them in
the file if necessary) with the last checked-in version of the file.
With a prefix argument, `C-x v =' reads a file name and two version
numbers, then compares those versions of the specified file.

   If you supply a directory name instead of the name of a work file,
this command compares the two specified versions of all registered files
in that directory and its subdirectories.  You can also specify a
snapshot name (Note: Snapshots.) instead of one or both version

   You can specify a checked-in version by its number; you can specify
the most recent checked-in version with an empty version number.

   This command works by running the `diff' utility, getting the
options from the variable `diff-switches'.  It displays the output in a
special buffer in another window.  Unlike the `M-x diff' command, `C-x
v =' does not try to find the changes in the old and new versions.
This is because one or both versions normally do not exist as files.
They exist only in the records of the master file.  Note: Comparing
Files, for more information about `M-x diff'.

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