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- DD(1L) DD(1L)
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-
- NAME
- dd - convert a file while copying it
-
- SYNOPSIS
- dd [--help] [--version] [if=file] [of=file] [ibs=bytes]
- [obs=bytes] [bs=bytes] [cbs=bytes] [skip=blocks]
- [seek=blocks] [count=blocks]
- [conv={ascii,ebcdic,ibm,block,unblock,lcase,ucase,swab,noerror,notrunc,
- sync}]
-
- DESCRIPTION
- This manual page documents the GNU version of dd. dd
- copies a file (from the standard input to the standard
- output, by default) with a user-selectable blocksize,
- while optionally performing conversions on it.
-
- OPTIONS
- Numbers can be followed by a multiplier:
- b=512, k=1024, w=2, xm=number m
-
- --help Print a usage message and exit with a non-zero sta-
- tus.
-
- --version
- Print version information on standard error then
- exit.
-
- if=file
- Read from file instead of the standard input.
-
- of=file
- Write to file instead of the standard output.
- Unless conv=notrunc is given, truncate file to the
- size specified by seek= (0 bytes if seek= is not
- given).
-
- ibs=bytes
- Read bytes bytes at a time.
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- obs=bytes
- Write bytes bytes at a time.
-
- bs=bytes
- Read and write bytes bytes at atime. Override ibs
- and obs.
-
- cbs=bytes
- Convert bytes bytes at a time.
-
- skip=blocks
- Skip blocks ibs-sized blocks at start of input.
-
- seek=blocks
- Skip blocks obs-sized blocks at start of output.
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-
-
- FSF GNU File Utilities 1
-
-
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-
-
- DD(1L) DD(1L)
-
-
- count=blocks
- Copy only blocks ibs-sized input blocks.
-
- conv=conversion[,conversion...]
- Convert the file as specified by the conversion
- arguments.
- Conversions:
-
- ascii Convert EBCDIC to ASCII.
-
- ebcdic Convert ASCII to EBCDIC.
-
- ibm Convert ASCII to alternate EBCDIC.
-
- block Pad newline-terminated records to size of
- cbs, replacing newline with trailing spaces.
-
- unblock
- Replace trailing spaces in cbs-sized block
- with newline.
-
- lcase Change uppercase characters to lowercase.
-
- ucase Change lowercase characters to uppercase.
-
- swab Swap every pair of input bytes. Unlike the
- Unix dd, this works when an odd number of
- bytes are read. If the input file contains
- an odd number of bytes, the last byte is
- simply copied (since there is nothing to
- swap it with).
-
- noerror
- Continue after read errors.
-
- notrunc
- Do not truncate the output file.
-
- sync Pad every input block to size of ibs with
- trailing NULs.
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- FSF GNU File Utilities 2
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