The history file
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The file `$CVSROOT/CVSROOT/history' is used to log information for
the `history' command (Note:history). This file must be created to
turn on logging. This is done automatically if the `cvs init' command
is used to set up the repository (Note:Creating a repository).
The file format of the `history' file is documented only in comments
in the CVS source code, but generally programs should use the `cvs
history' command to access it anyway, in case the format changes with
future releases of CVS.