COPYTAPE
Section: File Formats (5)
Updated: 8 August 1986
Index
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NAME
copytape - copytape intermediate data file format
DESCRIPTION
copytape
duplicates magtapes on single-tape systems by making
an intermediate copy of the tape in a disk file.
This disk file has a special format that preserves
the block boundaries and tape marks of the original
physical tape.
Each block is preceded by a header identifying what
sort of block it is. In the case of data blocks,
the length of the data is also given. Each header is
on a separate text line, followed by a newline character.
- CPTP:BLK nnnnnn
-
data\n
A data block is identified by the keyword
BLK.
The length of the block is given in a six-character
numeric field. The field is zero-padded on the left if
less than six characters are needed. The header is
followed by a newline character.
The original data follows. The data may have any characters
in it, since
copytape
uses a read(2) to extract it.
The data is followed by a newline, to make the file easy
to view with an editor.
- CPTP:MRK
-
A tape mark was encountered in the original tape.
- CPTP:EOT
-
When two consecutive tape marks are encountered,
copytape
treats the second as a logical end-of-tape. On
output, both MRK and EOT generate
a physical tape mark.
copytape
stops processing after copying an EOT.
SEE ALSO
mtio(4)
BUGS
Some weird tapes may not use two consecutive tape marks
as logical end-of-tape.
Index
- NAME
-
- DESCRIPTION
-
- SEE ALSO
-
- BUGS
-
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