od - Unix, Linux Command

previous next AddThis Social Bookmark Button


od - dump files in octal and other formats


od [OPTION]... [FILE]...
od [-abcdfilosx]... [FILE] [[+]OFFSET[.][b]]
od --traditional [OPTION]... [FILE] [[+]OFFSET[.][b] [+][LABEL][.][b]]


Write an unambiguous representation, octal bytes by default, of FILE to standard output. With more than one FILE argument, concatenate them in the listed order to form the input. With no FILE, or when FILE is -, read standard input.

All arguments to long options are mandatory for short options.

-A, --address-radix=RADIX
  decide how file offsets are printed
-j, --skip-bytes=BYTES
  skip BYTES input bytes first
-N, --read-bytes=BYTES
  limit dump to BYTES input bytes
-S, --strings[=BYTES]
  output strings of at least BYTES graphic chars
-t, --format=TYPE
  select output format or formats
-v, --output-duplicates
  do not use * to mark line suppression
-w, --width[=BYTES]
  output BYTES bytes per output line
  accept arguments in traditional form
--help display this help and exit
  output version information and exit

Traditional format specifications may be intermixed; they accumulate:

-a same as -t a, select named characters
-b same as -t o1, select octal bytes
-c same as -t c, select ASCII characters or backslash escapes
-d same as -t u2, select unsigned decimal 2-byte units
-f same as -t fF, select floats
-i same as -t dI, select decimal ints
-l same as -t dL, select decimal longs
-o same as -t o2, select octal 2-byte units
-s same as -t d2, select decimal 2-byte units
-x same as -t x2, select hexadecimal 2-byte units
If first and second call formats both apply, the second format is assumed if the last operand begins with + or (if there are 2 operands) a digit. An OFFSET operand means -j OFFSET. LABEL is the pseudo-address at first byte printed, incremented when dump is progressing. For OFFSET and LABEL, a 0x or 0X prefix indicates hexadecimal; suffixes may be . for octal and b for multiply by 512.
TYPE is made up of one or more of these specifications:
a named character
c ASCII character or backslash escape
  signed decimal, SIZE bytes per integer
  floating point, SIZE bytes per integer
  octal, SIZE bytes per integer
  unsigned decimal, SIZE bytes per integer
  hexadecimal, SIZE bytes per integer
SIZE is a number. For TYPE in doux, SIZE may also be C for sizeof(char), S for sizeof(short), I for sizeof(int) or L for sizeof(long). If TYPE is f, SIZE may also be F for sizeof(float), D for sizeof(double) or L for sizeof(long double).

RADIX is d for decimal, o for octal, x for hexadecimal or n for none. BYTES is hexadecimal with 0x or 0X prefix, it is multiplied by 512 with b suffix, by 1024 with k and by 1048576 with m. Adding a z suffix to any type adds a display of printable characters to the end of each line of output. --string without a number implies 3. --width without a number implies 32. By default, od uses -A o -t d2 -w 16.


Written by Jim Meyering.


Report bugs to <bug-coreutils@gnu.org>.


Copyright © 2006 Free Software Foundation, Inc.
This is free software. You may redistribute copies of it under the terms of the GNU General Public License <http://www.gnu.org/licenses/gpl.html>. There is NO WARRANTY, to the extent permitted by law.


od is maintained as a Texinfo manual. If the info and od programs are properly installed at your site, the command
info od
should give you access to the complete manual.
previous next Printer Friendly