Name
od — stdin stdout - file -- opt --help --version
Synopsis
od [options
] [files
]
When you want to view a binary file, consider od
(Octal Dump) for the job. It copies one
or more files to standard output, displaying their data in ASCII,
octal, decimal, hexadecimal, or floating point, in various sizes
(byte, short, long). For example, this command:
$ od -w8 /usr/bin/who
0000000 042577 043114 000401 000001
0000010 000000 000000 000000 000000
0000020 000002 000003 000001 000000
...
displays the bytes in binary file /usr/bin/who in octal, eight bytes per line. The column on the left contains the file offset of each row, again in octal.
If your binary file also contains text, consider the -tc
option, which displays character data.
For example, binary executables like who
contain the string “ELF” at the
beginning:
$ od -tc -w8 /usr/bin/who | head -3 0000000 177 E L F 001 001 001 \0 0000010 \0 \0 \0 \0 \0 \0 \0 \0 0000020 002 \0 003 \0 001 \0 \0 \0
Useful options
|
Display only the
first |
|
Begin the output at
byte |
|
Display
|
|
Group each row of bytes ... |
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