The behaviour of dd on OpenBSD 3.9 is noncompliant to it's own OpenBSD manpage:
OpenBSD:
[EMAIL PROTECTED]:~$ dd bs=1 skip=2
1234
1234
5+0 records in
5+0 records out
5 bytes transferred in 1.764 secs (3 bytes/sec)
Linux:
[EMAIL PROTECTED] ~ $ dd bs=1 skip=2
1234
34
3+0 records in
3+0 records out
3 bytes (3 B) copied, 1.71841 seconds, 0.0 kB/s
Excerpt from OpenBSD dd manpage:
skip=n Skip n blocks from the beginning of the input before copying.
On input which supports seeks, an lseek(2) operation is used.
Otherwise, input data is read and discarded. For pipes, the
correct number of bytes is read. For all other devices, the
correct number of blocks is read without distinguishing between
a partial or complete block being read.
bs=n Set both the input and output block size to n bytes, superseding
the ibs and obs operands. If no conversion values other than
noerror, notrunc, or sync are specified, then each input block
is copied to the output as a single block without any aggrega-
tion of short blocks.
if=file Read input from file instead of the standard input.
of=file Write output to file instead of the standard output. Any regu-
lar output file is truncated unless the notrunc conversion value
is specified. If an initial portion of the output file is
skipped (see the seek operand), the output file is truncated at
that point.
STANDARDS
The dd utility is expected to be a superset of the IEEE Std 1003.2
(``POSIX.2'') standard. The files operand and the ascii, ebcdic, ibm,
oldascii, oldebcdic, and oldibm values are extensions to the POSIX stan-
dard.
Does the POSIX specify the skip must work? If yes, then dd on OpenBSD 3.9 is
not POSIX compliant.
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