Linux Commands Examples

A great documentation place for Linux commands


dump files in octal and other formats


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

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alias od='od -t x1'
od -tx1 -An hoge.bin
echo od -Ad -tcx1 $1
od -Ad -tcx1 $1


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.
, --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 BYTES, --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[BYTES], --width[=BYTES]

output BYTES bytes per output line


accept arguments in traditional form


display this help and exit


output version information and exit

Traditional format specifications may be intermixed; they accumulate:


same as -t a, select named characters, ignoring high-order bit


same as -t o1, select octal bytes


same as -t c, select ASCII characters or backslash escapes


same as -t u2, select unsigned decimal 2-byte units


same as -t fF, select floats


same as -t dI, select decimal ints


same as -t dL, select decimal longs


same as -t o2, select octal 2-byte units


same as -t d2, select decimal 2-byte units


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:


named character, ignoring high-order bit


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, and may have a multiplier suffix: b 512, kB 1000, K 1024, MB 1000*1000, M 1024*1024, GB 1000*1000*1000, G 1024*1024*1024, and so on for T, P, E, Z, Y. Adding a z suffix to any type displays printable characters at the end of each output line. Option --string without a number implies 3; option --width without a number implies 32. By default, od uses -A o -t oS -w16.


Copyright © 2012 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <>.
This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.

reporting bugs

Report od bugs to bug-coreutils[:at:]gnu[:dot:]org
GNU coreutils home page: <>
General help using GNU software: <>
Report od translation bugs to <>

see also

The full documentation for od is maintained as a Texinfo manual. If the info and od programs are properly installed at your site, the command

info coreutils 'od invocation'

should give you access to the complete manual.


Written by Jim Meyering.

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