HP-UX Reference (11i v2 03/08) - 1 User Commands A-M (vol 1)

d
dd(1) dd(1)
ucase Map lower-case input characters to the corresponding upper-
case characters.
swab Swap every pair of input bytes.
noerror Do not stop processing on an input error. If the
sync conver-
sion symbol is also specified, missing input is replaced with null
bytes and processed normally; otherwise, the input block is
omitted from the output.
notrunc Do not truncate existing output file. Blocks in the output file not
overwritten by this invocation of
dd are preserved.
sync Pad every input block to size
ibs.Ifblock or unblock is
also specified, pad with space characters; otherwise, pad with
null bytes.
Where sizes are required, n indicates a numerical value in bytes. Numbers can be specified using the
forms:
n for n bytes
n
k for n Kbytes (n × 1024),
n
b for n blocks (n × 512), or
n
w for n words (n × 2).
To indicate a product, use
x to separate number pairs.
The
cbs option is used when block, unblock, ascii or ebcdic conversion is specified. In case of
ascii, cbs characters are placed into the conversion buffer, converted to ASCII, trailing blanks are
trimmed, and a newline is added before sending the line to the output. In case of ebcdic
, ASCII charac-
ters are read into the conversion buffer, converted to EBCDIC, and blanks are added to make up an out-
put block of size cbs.
EXTERNAL INFLUENCES
International Code Set Support
Single- and multi-byte character code sets are supported.
Environment Variables
The following environment variables affect execution of
dd:
LANG determines the locale when LC_ALL and a corresponding variable (beginning with
LC_) do not
specify a locale.
LC_ALL determines the locale used to override any values set by LANG or any environment variables
beginning with LC_.
The
LC_CTYPE variable determines the locale for the interpretation of sequences of bytes of text data as
characters (single-byte/multi-byte characters, upper-case/lower-case characters).
The
LC_MESSAGES variable determines the language in which messages are written.
RETURN VALUE
Exit values are:
0 Successful completion.
>0 Error condition occurred.
DIAGNOSTICS
Upon completion,
dd reports the number of input and output records:
f
+p records in Number of full and partial blocks read.
f+p records out Number of full and partial blocks written.
When
conv=block is specified and there is at least one truncated block, the number of truncated
records is also reported:
n
truncated records
EXAMPLES
Read an EBCDIC tape blocked ten 80-byte EBCDIC card images per block into an ASCII file named x:
HP-UX 11i Version 2: August 2003 − 2 − Hewlett-Packard Company Section 1−−169