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.\" DO NOT MODIFY THIS FILE! It was generated by help2man 1.35.
.TH DD "1" "March 2007" "GNU coreutils 6.9" "User Commands"
.SH NAME
dd \- convert and copy a file
.SH SYNOPSIS
.B dd
[\fIOPERAND\fR]...
.br
.B dd
\fIOPTION\fR
.SH DESCRIPTION
.\" Add any additional description here
.PP
Copy a file, converting and formatting according to the operands.
.TP
bs=BYTES
force ibs=BYTES and obs=BYTES
.TP
cbs=BYTES
convert BYTES bytes at a time
.TP
conv=CONVS
convert the file as per the comma separated symbol list
.TP
count=BLOCKS
copy only BLOCKS input blocks
.TP
ibs=BYTES
read BYTES bytes at a time
.TP
if=FILE
read from FILE instead of stdin
.TP
iflag=FLAGS
read as per the comma separated symbol list
.TP
obs=BYTES
write BYTES bytes at a time
.TP
of=FILE
write to FILE instead of stdout
.TP
oflag=FLAGS
write as per the comma separated symbol list
.TP
seek=BLOCKS
skip BLOCKS obs\-sized blocks at start of output
.TP
skip=BLOCKS
skip BLOCKS ibs\-sized blocks at start of input
.TP
status=noxfer
suppress transfer statistics
.PP
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.
.PP
Each CONV symbol may be:
.TP
ascii
from EBCDIC to ASCII
.TP
ebcdic
from ASCII to EBCDIC
.TP
ibm
from ASCII to alternate EBCDIC
.TP
block
pad newline\-terminated records with spaces to cbs\-size
.TP
unblock
replace trailing spaces in cbs\-size records with newline
.TP
lcase
change upper case to lower case
.TP
nocreat
do not create the output file
.TP
excl
fail if the output file already exists
.TP
notrunc
do not truncate the output file
.TP
ucase
change lower case to upper case
.TP
swab
swap every pair of input bytes
.TP
noerror
continue after read errors
.TP
sync
pad every input block with NULs to ibs\-size; when used
with block or unblock, pad with spaces rather than NULs
.TP
fdatasync
physically write output file data before finishing
.TP
fsync
likewise, but also write metadata
.PP
Each FLAG symbol may be:
.TP
append
append mode (makes sense only for output; conv=notrunc suggested)
.TP
direct
use direct I/O for data
.IP
directory fail unless a directory
dsync use synchronized I/O for data
sync likewise, but also for metadata
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
.PP
Sending a USR1 signal to a running `dd' process makes it
print I/O statistics to standard error and then resume copying.
.IP
\f(CW$ dd if=/dev/zero of=/dev/null& pid=$!\fR
.br
\f(CW$ kill -USR1 $pid; sleep 1; kill $pid\fR
.IP
18335302+0 records in
18335302+0 records out
9387674624 bytes (9.4 GB) copied, 34.6279 seconds, 271 MB/s
.PP
Options are:
.TP
\fB\-\-help\fR
display this help and exit
.TP
\fB\-\-version\fR
output version information and exit
.SH AUTHOR
Written by Paul Rubin, David MacKenzie, and Stuart Kemp.
.SH "REPORTING BUGS"
Report bugs to <bug\-coreutils@gnu.org>.
.SH COPYRIGHT
Copyright \(co 2007 Free Software Foundation, Inc.
.br
This is free software. You may redistribute copies of it under the terms of
the GNU General Public License <http://www.gnu.org/licenses/gpl.html>.
There is NO WARRANTY, to the extent permitted by law.
.SH "SEE ALSO"
The full documentation for
.B dd
is maintained as a Texinfo manual. If the
.B info
and
.B dd
programs are properly installed at your site, the command
.IP
.B info dd
.PP
should give you access to the complete manual.
|
