path: root/usr.bin/hexdump/od.1

.\"  $OpenBSD: od.1,v 1.32 2020/01/16 16:46:47 schwarze Exp $
.\"  $NetBSD: od.1,v 1.16 2001/12/07 01:23:42 bjh21 Exp $
.\"
.\" Copyright (c) 2001 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Andrew Brown.
.\"
.\" 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.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
.\"/
.Dd $Mdocdate: January 16 2020 $
.Dt OD 1
.Os
.Sh NAME
.Nm od
.Nd octal, decimal, hex, ascii dump
.Sh SYNOPSIS
.Nm od
.Op Fl aBbcDdeFfHhIiLlOosvXx
.Op Fl A Ar base
.Op Fl j Ar offset
.Op Fl N Ar length
.Op Fl t Ar type_string
.Op Ar
.Sh DESCRIPTION
The
.Nm
utility is a filter which displays the specified files, or standard
input if no files are specified, in a user specified format.
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl A Ar base
Specify the input address base.
The argument
.Ar base
may be one of
.Cm d ,
.Cm o ,
.Cm x ,
or
.Cm n ,
which specify decimal, octal, hexadecimal
addresses or no address, respectively.
.It Fl a
.Em One-byte character display .
Display the input offset in octal, followed by sixteen
space-separated, three column, space-filled, characters of input data
per line.
Control characters are printed as their names instead of as C-style escapes.
.It Fl B
Same as
.Fl o .
.It Fl b
.Em One-byte octal display .
Display the input offset in octal, followed by sixteen
space-separated, three column, zero-filled, bytes of input data, in
octal, per line.
This is the default output style if no other is selected.
.It Fl c
.Em One-byte character display .
Display the input offset in octal, followed by sixteen
space-separated, three column, space-filled, characters of input data
per line.
Control characters are printed as c style escapes, or as three octal digits,
if no c escape exists for the character.
.It Fl D
.Em Four-byte octal display .
Display the input offset in octal, followed by four space-separated,
ten column, space filled, four-byte units of input data, in octal, per line.
.It Fl d
.Em Two-byte unsigned decimal display .
Display the input offset in octal, followed by eight
space-separated, five column, zero-filled, two-byte units
of input data, in unsigned decimal, per line.
.It Fl e
.Em Eight-byte floating point display .
Display the input offset in octal, followed by two space-separated,
twenty-one column, space filled, eight-byte units of input data, in
floating point, per line.
.It Fl F
Same as
.Fl e .
.It Fl f
.Em Four-byte floating point display .
Display the input offset in octal, followed by four space-separated,
14 column, space filled, four-byte units of input data, in floating
point, per line.
.It Fl H
.Em Four-byte hex display .
Display the input offset in octal, followed by four space-separated,
eight column, zero filled, four-byte units of input data, in hex,
per line.
.It Fl h
.Em Two-byte hex display .
Display the input offset in octal, followed by eight space-separated,
four column, zero filled, two-byte units of input data, in hex,
per line.
.It Fl I
.Em Four-byte decimal display .
Display the input offset in octal, followed by four space-separated,
eleven column, space filled, four-byte units of input data, in
decimal, per line.
.It Fl i
.Em Two-byte decimal display .
Display the input offset in octal, followed by eight space-separated,
six column, space filled, two-byte units of input data, in decimal,
per line.
.It Fl j Ar offset
Skip
.Ar offset
bytes from the beginning of the input.
By default,
.Ar offset
is interpreted as a decimal number.
With a leading
.Cm 0x
or
.Cm 0X ,
.Ar offset
is interpreted as a hexadecimal number,
otherwise, with a leading
.Cm 0 ,
.Ar offset
is interpreted as an octal number.
Appending the character
.Cm b ,
.Cm k ,
or
.Cm m
to
.Ar offset
causes it to be interpreted as a multiple of
.Li 512 ,
.Li 1024 ,
or
.Li 1048576 ,
respectively.
.Pp
As an alternative to
.Nm
.Fl j Ar offset
.Op Ar file ,
the X/Open System Interfaces syntax
.Nm
.Op Ar file
.Sm off
.Op Cm \&+
.Ar offset
.Op Cm \&.
.Op Cm Bb
.Sm on
is also supported.
.It Fl L
Same as
.Fl I .
.It Fl l
Same as
.Fl I .
.It Fl N Ar length
Interpret only
.Ar length
bytes of input.
.It Fl O
.Em Four-byte octal display .
Display the input offset in octal, followed by four
space-separated, eleven column, zero-filled, four-byte units
of input data, in octal, per line.
.It Fl o
.Em Two-byte octal display .
Display the input offset in octal, followed by eight
space-separated, six column, zero-filled, two-byte units
of input data, in octal, per line.
.It Fl s
.Em Two-byte signed decimal display .
Display the input offset in octal, followed by eight
space-separated, five column, zero-filled, two-byte units
of input data, in signed decimal, per line.
.It Fl t Ar type_string
Specify one or more output types.
The
.Em type_string
option-argument must be a string specifying the types to be used when
writing the input data.
The string must consist of the type specification characters:
.Pp
.Cm a
selects US-ASCII output, with control characters replaced with their
names instead of as c escape sequences.
See also the
.Cm _u
conversion provided by
.Xr hexdump 1 .
.Pp
.Cm c
selects a standard character based conversion.
See also the
.Cm _c
conversion provided by
.Xr hexdump 1 .
.Pp
.Cm f
selects the floating point output format.
This type character can be optionally followed by the characters
.Cm 4
or
.Cm F
to specify four-byte floating point output, or
.Cm 8
or
.Cm L
to specify eight-byte floating point output.
The default output format is eight-byte floats.
See also the
.Cm e
conversion provided by
.Xr hexdump 1 .
.Pp
.Cm d ,
.Cm o ,
.Cm u ,
or
.Cm x
select decimal, octal, unsigned decimal, or hex output respectively.
These types can optionally be followed by
.Cm C
to specify
.Em char Ns -sized
output,
.Cm S
to specify
.Em short Ns -sized
output,
.Cm I
to specify
.Em int Ns -sized
output,
.Cm L
to specify
.Em long Ns -sized
output,
.Cm 1
to specify one-byte output,
.Cm 2
to specify two-byte output,
.Cm 4
to specify four-byte output, or
.Cm 8
to specify eight-byte output.
The default output format is in four-byte quantities.
See also the
.Cm d ,
.Cm o ,
.Cm u ,
and
.Cm x
conversions provided by
.Xr hexdump 1 .
.\"(a|c|f[FLD]?|[doux][C1S2I4L8]?)*
.It Fl v
The
.Fl v
option causes
.Nm
to display all input data.
Without the
.Fl v
option, any number of groups of output lines, which would be
identical to the immediately preceding group of output lines (except
for the input offsets), are replaced with a line comprised of a
single asterisk.
.It Fl X
Same as
.Fl H .
.It Fl x
Same as
.Fl h .
.El
.Pp
For each input file,
.Nm
sequentially copies the input to standard output, transforming the
data according to the options given.
If no options are specified, the default display is equivalent to
specifying the
.Fl o
option.
.Sh EXIT STATUS
.Ex -std od
.Sh SEE ALSO
.Xr hexdump 1
.Sh STANDARDS
The
.Nm
utility is compliant with the
.St -p1003.1-2008
specification.
.Pp
The flags
.Op Fl bcdosx
as well as the
.Ar offset
specifier are marked by
.St -p1003.1-2008
as being an
X/Open System Interfaces
option.
.Pp
The flags
.Op Fl aBDeFfHhIiLlOX
are extensions to that specification.
.Sh HISTORY
An
.Nm
command appears in
.At v1 .
.Pp
This man page was written in February 2001 by Andrew Brown, shortly
after he augmented the
.Nm
syntax to include things he felt had been missing for a long time.