NAME
sdd - disk dump and restore to and from tape or file; copy
and/or reblock
SYNOPSIS
sdd [ option=value ] [ -flag ]
DESCRIPTION
Sdd copies the specified input file to a specified output
file performing the requested conversions. The standard
input and output are used by default. The input and output
block size may be specified to take advantage of raw physi-
cal I/O.
After completion, sdd reports the number of whole records,
the sum of bytes from partial input and output blocks and
the total amount in kilo bytes on inout and output.
If ibs and obs differ, sdd is faster than dd due to the use
of an intelligent algorithm.
OPTIONS
-help
Print a summary of the available options.
if=name
Input is taken from file name; default is stdin.
of=name
Output is taken from file name; default is stdout. Note
that sdd creates and truncates the output file by
default; therefore the oseek=# option is useless
without the - notrunc option except in special cases
such as using magnetic tape or disk special files.
-inull
Do not read input from file. This is similar to
if=/dev/zero but much faster. Sdd uses a prepared
cleared buffer to satisfy writes.
-onull
Do not produce any output. This is similar to
of=/dev/null but actually does not write to any file.
ibs=#, obs=#, bs=#
Set input block size, output block size or both to #
(default 512 Bytes).
cbs=#
Set Conversion buffer size to #.
ivsize=#, ovsize=#
Set input volume size or output volume size to #. You
can make copies from devices of different size by using
this option. If you want to make a copy to a tape hav-
ing a size of 60 MBytes you should use the option
ovsize=60M. If the capacity of the tape is exceeded,
sdd wil ask for a second volume. In case ivsize is
exceeded, if N<cr> is typed, it is treated as an EOF
condition and sdd writes any buffered data to output
and exits. In case ovsize is exceeded, if N<cr> is
typed, sdd stops and the statistics it prints show that
more data were read than written.
count=#
Transfer # of input records or until EOF.
iseek=#, iskip=#
Seek/skip the first # Bytes from input before beginning
transfer.
oseek=#, oskip=#
Seek/skip the first # Bytes from output before begin-
ning transfer.
seek=#, skip=#
Seek/skip the first # Bytes from input and output
before beginning transfer.
ivseek=#, ovseek=#
Seek # Bytes from input/output at the beginning of each
input/output volume before beginning transfer. (You can
skip labels of disks and floppies with this option.)
Note that the iseek/oseek options still work, but only
apply to the first volume. Their values are added to
the values of ivseek and ovseek.
-notrunc
Do not truncate an already existing output file before
beginning transfer. This enables it to copy one file
into another.
-pg Print a dot to stderr each time a record is written to
indicate progress.
-time, -t
Report the total time and the transfer rate.
-noerror
Do not stop transfer on I/O errors. Error messages will
appear on the screen.
-noerrwrite
Do not write blocks that are not read corretly. Seek on
the output to skip the bad block. The output file must
be seekable or -noerrwrite will not work correctly.
-noseek
Do not seek after I/O errors. This implies try=1.
try=#
Set retry count to #. Only if -noerror was specified.
(default 2)
-debug
Turn on debugging messages. You can get knowledge about
record sizes on tapes with variable record size with
this option.
-fill
Pad every output record with zeros up to obs. If ibs
equals obs, or only bs was specified, every record will
be padded with zeros, otherwise this only applies to
the last record.
-swab
Swaps bytes (except for the last byte in odd block
sizes and odd transfers due to EOF).
-block, -unblock
Convert fixed length records to variable records and
vice versa.
-lcase, -ucase
Map alphabetics to lower/upper case.
-ascii, -ebcdic, -ibm
Convert EBCDIC to ASCII resp. ASCII to EBCDIC resp.
ASCII to the IBM variant of EBCDIC.
EXAMPLES
sdd if=/dev/rsd0a of=/dev/nrst8 bs=2x7x17b
Copies the disk /dev/rsd0a to the tape /dev/nrst8 using a
record size of 2*7*17 blocks. (this is 2 Cylinders.)
sdd if=/dev/rsd0c of=/dev/rsd1c seek=1b bs=63k
Copy the whole disk sd0 to sd1 preserving the old label on
disk sd1.
FILES
None.
SEE ALSO
dd(1), tr(1), cp(1), copy(1)
DIAGNOSTICS
sdd: Read f records + p bytes (total of x bytes = d.nnk).
sdd: Wrote f records + p bytes (total of x bytes = d.nnk).
The number of full records, the number of bytes in partial
records and the total amount of data in KBytes.
With the QUIT signal ( usually ^\ ) the actual state is
displayed.
NOTES
Opposed to dd, sdd is able to handle -iseek -oseek -seek as
well as -iskip -oskip -skip regardless to the buffer size.
You can make a whole physical copy of a disk without copying
the label in one pass of sdd.
When numbers are unspecified the are taken to be bytes.
You can make them `words' (2 bytes) if they are followed by
a `w' or `W'.
You can make them blocks (512 bytes) if they are followed by
a `b' or `B'.
You can make them Kbytes (1024 bytes) if they are followed
by a `k' or `K'.
You can make them Mbytes (1024 * 1024 bytes) if they are
followed by a `m' or `M'.
A pair of numbers may be separated by `*' or `x' to indicate
a product.
BUGS
The option iskip=# and oskip=# and skip=# as well as - block
and -unblock are not implemented.
It is confusing to allow the use of all additions together
with the record counter -count as they are possible with
obs=#.
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