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The `--update' (`-u') option updates a tar archive by comparing
the date of the specified archive members against the date of
the file with the same name. If the file has been modified more
recently than the archive member, then the archive member is deleted
(as with `--delete') and then the file is added to the archive
(as with `--append' (`-r')). On media where the `--delete' option
cannot be performed (such as magnetic tapes), the `--update' (`-u')
option similarly fails.
If no archive members are named (either on the command line or via `--files-from=file-of-names' (`-T file-of-names')), then the entire archive is processed in this manner.
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