Tar/Tape-Files
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9.6.2 Tape Files
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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 section 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 gave. See section Including a Label in the Archive.
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 The mt
Utility.
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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