|
|
|
bs=BYTES
|
| |
force ibs=BYTES and obs=BYTES
|
|
cbs=BYTES
|
| |
convert BYTES bytes at a time
|
|
conv=KEYWORDS
|
| |
convert the file as per the comma separated keyword list
|
|
count=BLOCKS
|
| |
copy only BLOCKS input blocks
|
|
ibs=BYTES
|
| |
read BYTES bytes at a time
|
|
if=FILE
|
| |
read from FILE instead of stdin
|
|
obs=BYTES
|
| |
write BYTES bytes at a time
|
|
of=FILE
|
| |
write to FILE instead of stdout
|
|
seek=BLOCKS
|
| |
skip BLOCKS obs-sized blocks at start of output
|
|
skip=BLOCKS
|
| |
skip BLOCKS ibs-sized blocks at start of input
|
|
--help
|
display this help and exit
|
|
--version
|
| |
output version information and exit
|
|
BLOCKS and BYTES may be followed by the following multiplicative suffixes:
xM M, c 1, w 2, b 512, kB 1000, K 1024, MB 1000*1000, M 1024*1024,
GB 1000*1000*1000, G 1024*1024*1024, and so on for T, P, E, Z, Y.
Each KEYWORD may be:
|
|
ascii
|
from EBCDIC to ASCII
|
|
ebcdic
|
from ASCII to EBCDIC
|
|
ibm
|
from ASCII to alternated EBCDIC
|
|
block
|
pad newline-terminated records with spaces to cbs-size
|
|
unblock
|
| |
replace trailing spaces in cbs-size records with newline
|
|
lcase
|
change upper case to lower case
|
|
notrunc
|
| |
do not truncate the output file
|
|
ucase
|
change lower case to upper case
|
|
swab
|
swap every pair of input bytes
|
|
noerror
|
| |
continue after read errors
|
|
sync
|
pad every input block with NULs to ibs-size; when used
|
|
|
with block or unblock, pad with spaces rather than NULs
|
|
Note that sending a SIGUSR1 signal to a running ‘dd’ process makes it
print to standard error the number of records read and written so far,
then to resume copying.
|
|
|
$ dd if=/dev/zero of=/dev/null& pid=$!
$ kill -USR1 $pid; sleep 1; kill $pid
|
|
|
10899206+0 records in
10899206+0 records out
|
|