( Tagging add/remove

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 4.8 Tagging and adding and removing files
 The subject of exactly how tagging interacts with adding and removing
 files is somewhat obscure; for the most part CVS will keep track of
 whether files exist or not without too much fussing.  By default, tags
 are applied to only files which have a revision corresponding to what
 is being tagged.  Files which did not exist yet, or which were already
 removed, simply omit the tag, and CVS knows to treat the absence of a
 tag as meaning that the file didn't exist as of that tag.
    However, this can lose a small amount of information.  For example,
 suppose a file was added and then removed.  Then, if the tag is missing
 for that file, there is no way to know whether the tag refers to the
 time before the file was added, or the time after it was removed.  If
 you specify the `-r' option to `cvs rtag', then CVS tags the files
 which have been removed, and thereby avoids this problem.  For example,
 one might specify `-r HEAD' to tag the head.
    On the subject of adding and removing files, the `cvs rtag' command
 has a `-a' option which means to clear the tag from removed files that
 would not otherwise be tagged.  For example, one might specify this
 option in conjunction with `-F' when moving a tag.  If one moved a tag
 without `-a', then the tag in the removed files might still refer to
 the old revision, rather than reflecting the fact that the file had
 been removed.  I don't think this is necessary if `-r' is specified, as
 noted above.
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