dd.1 (7d4b968b0fa6afc6bca132c27e2041c979ee6101) dd.1 (05d98029e9476e39b23f895225d36bf60f22ad91)
1.\"-
2.\" Copyright (c) 1990, 1993
3.\" The Regents of the University of California. All rights reserved.
4.\"
5.\" This code is derived from software contributed to Berkeley by
6.\" Keith Muller of the University of California, San Diego.
7.\"
8.\" Redistribution and use in source and binary forms, with or without

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27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30.\" SUCH DAMAGE.
31.\"
32.\" @(#)dd.1 8.2 (Berkeley) 1/13/94
33.\" $FreeBSD$
34.\"
1.\"-
2.\" Copyright (c) 1990, 1993
3.\" The Regents of the University of California. All rights reserved.
4.\"
5.\" This code is derived from software contributed to Berkeley by
6.\" Keith Muller of the University of California, San Diego.
7.\"
8.\" Redistribution and use in source and binary forms, with or without

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27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30.\" SUCH DAMAGE.
31.\"
32.\" @(#)dd.1 8.2 (Berkeley) 1/13/94
33.\" $FreeBSD$
34.\"
35.Dd January 23, 2009
35.Dd October 1, 2013
36.Dt DD 1
37.Os
38.Sh NAME
39.Nm dd
40.Nd convert and copy a file
41.Sh SYNOPSIS
42.Nm
43.Op Ar operands ...

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373in the same format as the standard completion message and
374.Nm
375will exit.
376.Sh EXIT STATUS
377.Ex -std
378.Sh EXAMPLES
379Check that a disk drive contains no bad blocks:
380.Pp
36.Dt DD 1
37.Os
38.Sh NAME
39.Nm dd
40.Nd convert and copy a file
41.Sh SYNOPSIS
42.Nm
43.Op Ar operands ...

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373in the same format as the standard completion message and
374.Nm
375will exit.
376.Sh EXIT STATUS
377.Ex -std
378.Sh EXAMPLES
379Check that a disk drive contains no bad blocks:
380.Pp
381.Dl "dd if=/dev/ad0 of=/dev/null bs=1m"
381.Dl "dd if=/dev/ada0 of=/dev/null bs=1m"
382.Pp
383Do a refresh of a disk drive, in order to prevent presently
384recoverable read errors from progressing into unrecoverable read errors:
385.Pp
382.Pp
383Do a refresh of a disk drive, in order to prevent presently
384recoverable read errors from progressing into unrecoverable read errors:
385.Pp
386.Dl "dd if=/dev/ad0 of=/dev/ad0 bs=1m"
386.Dl "dd if=/dev/ada0 of=/dev/ada0 bs=1m"
387.Pp
388Remove parity bit from a file:
389.Pp
390.Dl "dd if=file conv=parnone of=file.txt"
391.Pp
392Check for (even) parity errors on a file:
393.Pp
394.Dl "dd if=file conv=pareven | cmp -x - file"

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387.Pp
388Remove parity bit from a file:
389.Pp
390.Dl "dd if=file conv=parnone of=file.txt"
391.Pp
392Check for (even) parity errors on a file:
393.Pp
394.Dl "dd if=file conv=pareven | cmp -x - file"

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