Main index | Section 1 | 日本語 | Options |
The options are as follows:
| |
One-byte octal display. Display the input offset in hexadecimal, followed by sixteen space-separated, three column, zero-filled, bytes of input data, in octal, per line. | |
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One-byte character display. Display the input offset in hexadecimal, followed by sixteen space-separated, three column, space-filled, characters of input data per line. | |
| |
Canonical hex+ASCII display.
Display the input offset in hexadecimal, followed by sixteen
space-separated, two column, hexadecimal bytes, followed by the
same sixteen bytes in %_p format enclosed in ``|'' characters.
Calling the command hd implies this option. | |
| |
Two-byte decimal display. Display the input offset in hexadecimal, followed by eight space-separated, five column, zero-filled, two-byte units of input data, in unsigned decimal, per line. | |
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Specify a format string to be used for displaying data. | |
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Specify a file that contains one or more newline separated format strings. Empty lines and lines whose first non-blank character is a hash mark ( amp;#) are ignored. | |
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Interpret only length bytes of input. | |
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Two-byte octal display. Display the input offset in hexadecimal, followed by eight space-separated, six column, zero-filled, two byte quantities of input data, in octal, per line. | |
| |
Skip offset bytes from the beginning of the input. By default, offset is interpreted as a decimal number. With a leading 0x or 0X, offset is interpreted as a hexadecimal number, otherwise, with a leading 0, offset is interpreted as an octal number. Appending the character b, k, or m to offset causes it to be interpreted as a multiple of 512, 1024, or 1048576, respectively. | |
| |
Cause
hexdump
to display all input data.
Without the
| |
| |
Two-byte hexadecimal display. Display the input offset in hexadecimal, followed by eight, space separated, four column, zero-filled, two-byte quantities of input data, in hexadecimal, per line. | |
For each input file,
hexdump
sequentially copies the input to standard output, transforming the
data according to the format strings specified by the
The iteration count is an optional positive integer, which defaults to one. Each format is applied iteration count times.
The byte count is an optional positive integer. If specified it defines the number of bytes to be interpreted by each iteration of the format.
If an iteration count and/or a byte count is specified, a single slash must be placed after the iteration count and/or before the byte count to disambiguate them. Any whitespace before or after the slash is ignored.
The format is required and must be surrounded by double quote (" ") marks. It is interpreted as a fprintf-style format string (see fprintf(3)), with the following exceptions:
NUL | \0 |
<alert character> | \a |
<backspace> | \b |
<form-feed> | \f |
<newline> | \n |
<carriage return> | \r |
<tab> | \t |
<vertical tab> | \v |
The hexdump utility also supports the following additional conversion strings:
amp;_a[ dox] | |||||||||||||||||||||||||||||||||||||
Display the input offset, cumulative across input files, of the next byte to be displayed. The appended characters d, o, and x specify the display base as decimal, octal or hexadecimal respectively. | |||||||||||||||||||||||||||||||||||||
amp;_A[ dox] | |||||||||||||||||||||||||||||||||||||
Identical to the amp;_a conversion string except that it is only performed once, when all of the input data has been processed. | |||||||||||||||||||||||||||||||||||||
amp;_c | Output characters in the default character set. Nonprinting characters are displayed in three character, zero-padded octal, except for those representable by standard escape notation (see above), which are displayed as two character strings. | ||||||||||||||||||||||||||||||||||||
_p | Output characters in the default character set. Nonprinting characters are displayed as a single " amp;.". | ||||||||||||||||||||||||||||||||||||
_u |
Output US
ASCII
characters, with the exception that control characters are
displayed using the following, lower-case, names.
Characters greater than 0xff, hexadecimal, are displayed as hexadecimal
strings.
| ||||||||||||||||||||||||||||||||||||
The default and supported byte counts for the conversion characters are as follows:
amp;%_c, amp;%_p, amp;%_u, amp;%c | |
One byte counts only. | |
amp;%d, amp;%i, amp;%o, amp;%u, amp;%X, amp;%x Four byte default, one, two and four byte counts supported. | |
amp;%E, amp;%e, amp;%f, amp;%G, amp;%g Eight byte default, four and twelve byte counts supported. | |
The amount of data interpreted by each format string is the sum of the data required by each format unit, which is the iteration count times the byte count, or the iteration count times the number of bytes required by the format if the byte count is not specified.
The input is manipulated in ``blocks'', where a block is defined as the largest amount of data specified by any format string. Format strings interpreting less than an input block's worth of data, whose last format unit both interprets some number of bytes and does not have a specified iteration count, have the iteration count incremented until the entire input block has been processed or there is not enough data remaining in the block to satisfy the format string.
If, either as a result of user specification or hexdump modifying the iteration count as described above, an iteration count is greater than one, no trailing whitespace characters are output during the last iteration.
It is an error to specify a byte count as well as multiple conversion characters or strings unless all but one of the conversion characters or strings is amp;_a or amp;_A.
If, as a result of the specification of the
Further output by such format strings is replaced by an equivalent number of spaces. An equivalent number of spaces is defined as the number of spaces output by an s conversion character with the same field width and precision as the original conversion character or conversion string but with any "amp;+", "amp; amp;", "amp;#" conversion flag characters removed, and referencing a NULL string.
If no format strings are specified, the default display is equivalent
to specifying the
"%06.6_ao " 12/1 "%3_u " "\t\t" "%_p " "\n"
Implement the -x option:
"%07.7_Ax\n" "%07.7_ax " 8/2 "%04x " "\n"
HEXDUMP (1) | October 29, 2014 |
Main index | Section 1 | 日本語 | Options |
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