od — stdin stdout - file -- opt --help --version
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 0000010 0000020 002 003 001
|
Display only the
first |
|
Begin the output at
byte |
|
Display
|
|
Group each row of
bytes into sequences of |
|
Display file offsets
in the leftmost column, in decimal ( |
|
Display output in a
character format, with nonalphanumeric characters printed as
escape sequences ( |
|
Display output in an
integer format, including octal ( |
|
Display output in
floating point. |
Appending z
to the -t
option prints a new column on the
right-hand side of the output, displaying the printable characters
on each line, much like the default output of xxd
.
3.144.84.155