Tar/mt
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9.5.2 The mt
Utility
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See Is it true that this only works on non-block devices? should explain the difference, (fixed or variable).
See section The Blocking Factor of an Archive.
You can use the mt
utility to advance or rewind a tape past a
specified number of archive files on the tape. This will allow you
to move to the beginning of an archive before extracting or reading
it, or to the end of all the archives before writing a new one.
See Why isn't there an "advance 'til you find two tape marks
together"?
The syntax of the mt
command is:
mt [-f tapename] operation [number] |
where tapename
is the name of the tape device, number
is
the number of times an operation is performed (with a default of one),
and operation
is one of the following:
See is there any use for record operations?
`eof'
`weof'
- Writes
number
tape marks at the current position on the tape. `fsf'
- Moves tape position forward
number
files. `bsf'
- Moves tape position back
number
files. `rewind'
- Rewinds the tape. (Ignores
number
.) `offline'
`rewoff1'
- Rewinds the tape and takes the tape device off-line. (Ignores
number
.) `status'
- Prints status information about the tape unit.
If you don't specify a tapename
, mt
uses the environment
variable TAPE
; if TAPE
is not set, mt
will use
the default device specified in your `sys/mtio.h'
file
(DEFTAPE
variable). If this is not defined, the program will
display a descriptive error message and exit with code 1.
mt
returns a 0 exit status when the operation(s) were
successful, 1 if the command was unrecognized, and 2 if an operation
failed.
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