2005-05-02 15:01:42 +02:00
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.TH DD 1
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.SH NAME
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dd \- convert and copy a file
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.SH SYNOPSIS
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\fBdd\fR [\fIoption = value\fR] ...\fR
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.br
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.de FL
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.TP
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\\fB\\$1\\fR
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\\$2
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..
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.de EX
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.TP 20
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\\fB\\$1\\fR
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# \\$2
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..
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.SH EXAMPLES
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2012-03-31 23:44:29 +02:00
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.TP 20
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.B dd if=/dev/fd0 of=/dev/fd1
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# Copy disk 0 to disk 1
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.TP 20
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.B dd if=x of=y bs=1w skip=4
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# Copy \fIx\fP to \fIy\fP, skipping 4 words
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.TP 20
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.B dd if=x of=y count=3
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# Copy three 512\-byte blocks
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2005-05-02 15:01:42 +02:00
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.SH DESCRIPTION
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.PP
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This command is intended for copying partial files.
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The block size, skip count, and number of blocks to copy can be specified.
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The options are:
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.PP
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.ta 0.25i 1.5i
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\fBif\fR = file \- Input file (default is \fIstdin\fR)
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.br
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\fBof\fR = file \- Output file (default is standard output)
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.br
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\fBibs\fR = n \- Input block size (default 512 bytes)
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.br
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\fBobs\fR = n \- Output block size (default is 512 bytes)
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.br
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\fBbs\fR = n \- Block size; sets \fIibs\fP and \fIobs\fP (default is 512 bytes)
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.br
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\fBskip\fR = n \- Skip \fIn\fP input blocks before reading
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.br
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\fBseek\fR = n \- Skip \fIn\fP output blocks before writing
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.br
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\fBcount\fR = n \- Copy only \fIn\fP input blocks
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.br
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\fBconv = lcase\fR \- Convert upper case letters to lower case
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.br
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\fBconv = ucase\fR \- Convert lower case letters to upper case
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.br
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\fBconv = swab\fR \- Swap every pair of bytes
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.br
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\fBconv = noerror\fR \- Ignore errors and just keep going
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2010-01-27 08:48:06 +01:00
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.br
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\fBconv = notrunc\fR \- Do not truncate unmodified blocks
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2005-05-02 15:01:42 +02:00
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.br
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2005-08-22 14:56:02 +02:00
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\fBconv = silent\fR \- Suppress statistics (MINIX 3 specific flag)
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2005-05-02 15:01:42 +02:00
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.PP
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Where sizes are expected, they are in bytes.
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However, the letters \fBw\fR, \fBb\fR, or \fBk\fR may be appended to the
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number to indicate words (2 bytes), blocks (512 bytes), or K
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(1024 bytes), respectively.
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When
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.I dd
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is finished, it reports the number of full and partial blocks read and written.
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.SH "SEE ALSO"
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.BR vol (1).
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