Интерактивная система просмотра системных руководств (man-ов)
dd (1)
dd (1) ( Solaris man: Команды и прикладные программы пользовательского уровня )
dd (1) ( FreeBSD man: Команды и прикладные программы пользовательского уровня )
dd (1) ( Русские man: Команды и прикладные программы пользовательского уровня )
>> dd (1) ( Linux man: Команды и прикладные программы пользовательского уровня )
dd (1) ( POSIX man: Команды и прикладные программы пользовательского уровня )
dd (8) ( Русские man: Команды системного администрирования )
NAME
dd - convert and copy a file
SYNOPSIS
dd
[OPERAND]...
ddOPTION
DESCRIPTION
Copy a file, converting and formatting according to the operands.
bs=BYTES
force ibs=BYTES and obs=BYTES
cbs=BYTES
convert BYTES bytes at a time
conv=CONVS
convert the file as per the comma separated symbol list
count=BLOCKS
copy only BLOCKS input blocks
ibs=BYTES
read BYTES bytes at a time
if=FILE
read from FILE instead of stdin
iflag=FLAGS
read as per the comma separated symbol list
obs=BYTES
write BYTES bytes at a time
of=FILE
write to FILE instead of stdout
oflag=FLAGS
write as per the comma separated symbol list
seek=BLOCKS
skip BLOCKS obs-sized blocks at start of output
skip=BLOCKS
skip BLOCKS ibs-sized blocks at start of input
status=noxfer
suppress transfer statistics
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 CONV symbol may be:
ascii
from EBCDIC to ASCII
ebcdic
from ASCII to EBCDIC
ibm
from ASCII to alternate 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
nocreat
do not create the output file
excl
fail if the output file already exists
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
fdatasync physically write output file data before finishing
fsync likewise, but also write metadata
Each FLAG symbol may be:
append
append mode (makes sense only for output)
direct
use direct I/O for data
dsync
use synchronized I/O for data
sync
likewise, but also for metadata
nonblock
use non-blocking I/O
nofollow
do not follow symlinks
noctty
do not assign controlling terminal from file
Sending a USR1 signal to a running `dd' process makes it
print I/O statistics to standard error and then resume copying.
