Linux中关于dd命令的使用实例教程

bs=BYTES  read and write BYTES bytes at a time (also see ibs=,obs=)

cbs=BYTES  convert BYTES bytes at a time

conv=CONVS  convert the file as per the comma separated symbol list

count=N   copy only N input blocks

ibs=BYTES  read BYTES bytes at a time (default: 512)

if=FILE   read from FILE instead of stdin(默认为标准输入)

iflag=FLAGS  read as per the comma separated symbol list

obs=BYTES  write BYTES bytes at a time (default: 512)

of=FILE   write to FILE instead of stdout(默认为标准输出)

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=WHICH WHICH info to suppress outputting to stderr;

    'noxfer' suppresses transfer stats, 'none' suppresses all

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

sparse try to seek rather than write the output for NUL input blocks

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

append append mode (makes sense only for output; conv=notrunc suggested)

direct use direct I/O for data

directory fail unless a directory

dsync  use synchronized I/O for data

sync  likewise, but also for metadata

fullblock accumulate full blocks of input (iflag only)

nonblock use non-blocking I/O

noatime do not update access time

noctty do not assign controlling terminal from file

nofollow do not follow symlinks

count_bytes treat 'count=N' as a byte count (iflag only)

c =1, w =2, b =512, kB =1000, K =1024, MB =1000*1000, M =1024*1024, xM =M

GB =1000*1000*1000, G =1024*1024*1024, and so on for T, P, E, Z, Y