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from: @(#)hexdump.1 8.2 (Berkeley) 4/18/94
.Dd June 24, 2012 .Dt HEXDUMP 1 .Os .Sh NAME .Nm hexdump .Nd ascii, decimal, hexadecimal, octal dump .Sh SYNOPSIS .Nm .Op Fl bCcdovx .Op Fl e Ar format_string .Op Fl f Ar format_file .Op Fl n Ar length .Op Fl s Ar skip .Op Ar .Sh DESCRIPTION The .Nm utility is a filter which displays each specified .Ar file , or the standard input if no .Ar file arguments are specified, in a user specified format.
p The options are as follows: l -tag -width Fl t Fl b .Em 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. t Fl C .Em 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 .Sq | characters. t Fl c .Em 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. t Fl d .Em 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. t Fl e Ar format_string Specify a format string to be used for displaying data. t Fl f Ar format_file 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
q Sq # are ignored. t Fl n Ar length Interpret only .Ar length bytes of input. t Fl o .Em 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. t Fl s Ar skip Skip .Ar skip bytes from the beginning of the input. By default, .Ar skip is interpreted as a decimal number. With a leading .Cm 0x or .Cm 0X , .Ar skip is interpreted as a hexadecimal number; otherwise, with a leading .Cm 0 , .Ar skip is interpreted as an octal number. Appending the character .Cm b , .Cm k , or .Cm m to .Ar skip causes it to be interpreted as a multiple of .Li 512 , .Li 1024 , or .Li 1048576 , respectively. t 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 containing a single asterisk
q Sq * . t Fl x .Em 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. .El
p For each input file, .Nm sequentially copies the input to standard output, transforming the data according to the format strings specified by the .Fl e and .Fl f options, in the order that they were specified. .Ss Formats A format string contains any number of format units, separated by whitespace. A format unit contains up to three items: an iteration count, a byte count, and a format.
p The iteration count is an optional positive integer, which defaults to one. Each format is applied iteration count times.
p 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.
p If an iteration count and/or a byte count is specified, a single slash
q Sq / 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.
p The format is required and must be surrounded by double quote
q Sq " marks. It is interpreted as a fprintf-style format string (see .Xr fprintf 3 ) , with the following exceptions: l -bullet -offset indent t An asterisk
q Sq * may not be used as a field width or precision. t A byte count or field precision .Em is required for each .Sq s conversion character (unlike the .Xr fprintf 3 default which prints the entire string if the precision is unspecified). t The conversion characters .Sq h , .Sq l , .Sq n , .Sq p , and .Sq q are not supported. t The single character escape sequences described in the C standard are supported: d -ragged -offset indent -compact l -column Xalert_characterX t NUL \e0 t Aq alert character \ea t Aq backspace \eb t Aq form-feed \ef t Aq newline \en t Aq carriage return \er t Aq tab \et t Aq vertical tab \ev .El .Ed .El
p .Nm also supports the following additional conversion strings: l -tag -width Fl t Cm _a Ns Op Cm dox Display the input offset, cumulative across input files, of the next byte to be displayed. The appended characters .Cm d , .Cm o , and .Cm x specify the display base as decimal, octal or hexadecimal respectively. t Cm _A Ns Op Cm dox Identical to the .Cm _a conversion string except that it is only performed once, when all of the input data has been processed. t Cm _c Output characters in the default character set. Non-printing 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. t Cm _p Output characters in the default character set. Non-printing characters are displayed as a single .Sq Cm . . t Cm _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. l -column 000_nu 001_so 002_st 003_et 004_eo t 000 nul Ta 001 soh Ta 002 stx Ta 003 etx Ta 004 eot Ta 005 enq t 006 ack Ta 007 bel Ta 008 bs Ta 009 ht Ta 00A lf Ta 00B vt t 00C ff Ta 00D cr Ta 00E so Ta 00F si Ta 010 dle Ta 011 dc1 t 012 dc2 Ta 013 dc3 Ta 014 dc4 Ta 015 nak Ta 016 syn Ta 017 etb t 018 can Ta 019 em Ta 01A sub Ta 01B esc Ta 01C fs Ta 01D gs t 01E rs Ta 01F us Ta 07F del .El .El
p The default and supported byte counts for the conversion characters are as follows: l -tag -width "Xc,_Xc,_Xc,_Xc,_Xc,_Xc" -offset indent t Li %_c , %_p , %_u , %c One byte counts only. t Li %d , %i , %o , %u , %X , %x Four byte default, one, two, four and eight byte counts supported. t Li %E , %e , %f , %G , %g Eight byte default, four byte counts supported. .El
p 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.
p The input is manipulated in .Dq 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.
p If, either as a result of user specification or .Nm modifying the iteration count as described above, an iteration count is greater than one, no trailing whitespace characters are output during the last iteration.
p 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 .Cm _a or .Cm _A .
p If, as a result of the specification of the .Fl n option or end-of-file being reached, input data only partially satisfies a format string, the input block is zero-padded sufficiently to display all available data (i.e. any format units overlapping the end of data will display some number of the zero bytes).
p 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 .Cm s conversion character with the same field width and precision as the original conversion character or conversion string but with any .Sq Li + , .Sq \ , and .Sq Li # conversion flag characters removed, and referencing a .Dv NULL string.
p If no format strings are specified, the default display is equivalent to specifying the .Fl x option. .Sh EXIT STATUS .Ex -std .Sh EXAMPLES Display the input in perusal format: d -literal -offset indent "%06.6_ao " 12/1 "%3_u " "\et\et" "%_p " "\en" .Ed
p Implement the .Fl x option: d -literal -offset indent "%07.7_Ax\en" "%07.7_ax " 8/2 "%04x " "\en" .Ed .Sh SEE ALSO .Xr od 1