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freebsd/usr.bin/hexdump/od.1

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.\" Copyright (c) 1990, 1993
.\" The Regents of the University of California. All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 4. Neither the name of the University nor the names of its contributors
.\" may be used to endorse or promote products derived from this software
.\" without specific prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" @(#)od.1 8.1 (Berkeley) 6/6/93
1999-08-28 01:08:13 +00:00
.\" $FreeBSD$
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.\"
.Dd December 22, 2011
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.Dt OD 1
.Os
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.Sh NAME
.Nm od
.Nd octal, decimal, hex, ASCII dump
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.Sh SYNOPSIS
.Nm
.Op Fl aBbcDdeFfHhIiLlOosvXx
.Op Fl A Ar base
.Op Fl j Ar skip
.Op Fl N Ar length
.Op Fl t Ar type
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.Op Oo Cm + Oc Ns Ar offset Ns Oo Cm \&. Oc Ns Op Cm Bb
.Op Ar
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.Sh DESCRIPTION
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The
.Nm
utility is a filter which displays the specified files, or standard
input if no files are specified, in a user specified format.
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.Pp
The options are as follows:
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.Bl -tag -width ".Fl I , L , l"
.It Fl A Ar base
Specify the input address base.
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The argument
.Ar base
may be one of
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.Cm d ,
.Cm o ,
.Cm x
or
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.Cm n ,
which specify decimal, octal, hexadecimal
addresses or no address, respectively.
.It Fl a
Output named characters.
Equivalent to
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.Fl t Cm a .
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.It Fl B , o
Output octal shorts.
Equivalent to
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.Fl t Cm o2 .
.It Fl b
Output octal bytes.
Equivalent to
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.Fl t Cm o1 .
.It Fl c
Output C-style escaped characters.
Equivalent to
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.Fl t Cm c .
.It Fl D
Output unsigned decimal ints.
Equivalent to
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.Fl t Cm u4 .
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.It Fl d
Output unsigned decimal shorts.
Equivalent to
.Fl t Cm u2 .
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.It Fl e , F
Output double-precision floating point numbers.
Equivalent to
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.Fl t Cm fD .
.It Fl f
Output single-precision floating point numbers.
Equivalent to
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.Fl t Cm fF .
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.It Fl H , X
Output hexadecimal ints.
Equivalent to
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.Fl t Cm x4 .
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.It Fl h , x
Output hexadecimal shorts.
Equivalent to
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.Fl t Cm x2 .
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.It Fl I , L , l
Output signed decimal longs.
Equivalent to
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.Fl t Cm dL .
.It Fl i
Output signed decimal ints.
Equivalent to
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.Fl t Cm dI .
.It Fl j Ar skip
Skip
.Ar skip
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bytes of the combined input before dumping.
The number may be followed by one
of
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.Cm b , k
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or
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.Cm m
which specify the units of the number as blocks (512 bytes), kilobytes and
megabytes, respectively.
.It Fl N Ar length
Dump at most
.Ar length
bytes of input.
.It Fl O
Output octal ints.
Equivalent to
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.Fl t Cm o4 .
.It Fl s
Output signed decimal shorts.
Equivalent to
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.Fl t Cm d2 .
.It Fl t Ar type
Specify the output format.
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The
.Ar type
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argument
is a string containing one or more of the following kinds of type specifiers:
.Bl -tag -width indent
.It Cm a
Named characters
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.Pq Tn ASCII .
Control characters are displayed using the following names:
.Bl -column "000 NUL" "001 SOH" "002 STX" "003 ETX" "004 EOT" "005 ENQ"
.It "000 NUL 001 SOH 002 STX 003 ETX 004 EOT 005 ENQ"
.It "006 ACK 007 BEL 008 BS 009 HT 00A NL 00B VT"
.It "00C FF 00D CR 00E SO 00F SI 010 DLE 011 DC1"
.It "012 DC2 013 DC3 014 DC4 015 NAK 016 SYN 017 ETB"
.It "018 CAN 019 EM 01A SUB 01B ESC 01C FS 01D GS"
.It "01E RS 01F US 020 SP 07F DEL \& \&"
.El
.It Cm c
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Characters in the default character set.
Non-printing characters are
represented as 3-digit octal character codes, except the following
characters, which are represented as C escapes:
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.Pp
.Bl -tag -width carriage-return -compact
.It NUL
\e0
.It alert
\ea
.It backspace
\eb
.It newline
\en
.It carriage-return
\er
.It tab
\et
.It vertical tab
\ev
.El
.Pp
Multi-byte characters are displayed in the area corresponding to the first
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byte of the character.
The remaining bytes are shown as
.Ql ** .
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.It Xo
.Sm off
.Op Cm d | o | u | x
.Op Cm C | S | I | L | Ar n
.Sm on
.Xc
Signed decimal
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.Pq Cm d ,
octal
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.Pq Cm o ,
unsigned decimal
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.Pq Cm u
or
hexadecimal
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.Pq Cm x .
Followed by an optional size specifier, which may be either
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.Cm C
.Pq Vt char ,
.Cm S
.Pq Vt short ,
.Cm I
.Pq Vt int ,
.Cm L
.Pq Vt long ,
or a byte count as a decimal integer.
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.It Xo
.Sm off
.Cm f
.Op Cm F | D | L | Ar n
.Sm on
.Xc
Floating-point number.
Followed by an optional size specifier, which may be either
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.Cm F
.Pq Vt float ,
.Cm D
.Pq Vt double
or
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.Cm L
.Pq Vt "long double" .
.El
.It Fl v
Write all input data, instead of replacing lines of duplicate values with a
.Ql * .
.El
.Pp
Multiple options that specify output format may be used; the output will
contain one line for each format.
.Pp
If no output format is specified,
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.Fl t Cm oS
is assumed.
.Sh ENVIRONMENT
The
.Ev LANG , LC_ALL
and
.Ev LC_CTYPE
environment variables affect the execution of
.Nm
as described in
.Xr environ 7 .
.Sh EXIT STATUS
.Ex -std
.Sh COMPATIBILITY
The traditional
.Fl s
option to extract string constants is not supported; consider using
.Xr strings 1
instead.
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.Sh SEE ALSO
.Xr hexdump 1 ,
.Xr strings 1
.Sh STANDARDS
The
.Nm
utility conforms to
.St -p1003.1-2001 .
.Sh HISTORY
An
.Nm
command appeared in
.At v1 .