dd - convert and copy a file
Copy a file, converting and formatting according to the options.
- force ibs=BYTES and obs=BYTES
- convert BYTES bytes at a time
- convert the file as per the comma separated keyword list
- copy only BLOCKS input blocks
- read BYTES bytes at a time
- read from FILE instead of stdin
- write BYTES bytes at a time
- write to FILE instead of stdout
- skip BLOCKS obs-sized blocks at start of output
- skip BLOCKS ibs-sized blocks at start of input
- display this help and exit
- output version information and exit
BLOCKS and BYTES may be followed by the following multiplicative suffixes:
xM M, c 1, w 2, b 512, kD 1000, k 1024, MD 1,000,000, M 1,048,576,
GD 1,000,000,000, G 1,073,741,824, and so on for T, P, E, Z, Y.
Each KEYWORD may be:
- from EBCDIC to ASCII
- from ASCII to EBCDIC
- from ASCII to alternated EBCDIC
- pad newline-terminated records with spaces to cbs-size
- replace trailing spaces in cbs-size records with newline
- change upper case to lower case
- do not truncate the output file
- change lower case to upper case
- swap every pair of input bytes
- continue after read errors
- pad every input block with NULs to ibs-size; when used
- with block or unblock, pad with spaces rather than NULs
Written by Paul Rubin, David MacKenzie, and Stuart Kemp.
Report bugs to <firstname.lastname@example.org>.
Copyright © 2001 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.