To give the archive a name which will be recorded in it, use the
--label=volume-label (-V volume-label)
option. This will write a special block identifying
volume-label as the name of the archive to the front of the
archive which will be displayed when the archive is listed with
--list. If you are creating a multi-volume archive with
--multi-volume (see Using Multiple Tapes), then the
volume label will have ‘Volume nnn’ appended to the name
you give, where nnn is the number of the volume of the archive.
(If you use the --label=volume-label) option when
reading an archive, it checks to make sure the label on the tape
matches the one you give. See label.
When tar writes an archive to tape, it creates a single
tape file. If multiple archives are written to the same tape, one
after the other, they each get written as separate tape files. When
extracting, it is necessary to position the tape at the right place
before running tar. To do this, use the mt command.
For more information on the mt command and on the organization
of tapes into a sequence of tape files, see mt.
People seem to often do:
--label="some-prefix `date +some-format`"
or such, for pushing a common date in all volumes or an archive set.
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