Linux view commands in the OD command detailed _linux

OD (octal dump) command

The OD (octal dump) command can display files or streams in eight, decimal, hexadecimal, and ASCII formats, which are useful for accessing or visually inspecting characters in a file that cannot be displayed directly on the terminal, such as line breaks. In addition, empty locations can be viewed by OD commands in some empty files.

General use Format:

OD [-ABBCDDEFFHHIILLOOSVXX] [-A base] [-j Skip] [-N-length] [-t type] [[+]offset[.] [Bb]] [File ...]

For a simplified version:

OD [-A address into] [-t display format] file name

which

-A (address system) displays the address information according to the specified system;

-t specifies the format of the data display.

The address system specified by-a includes:

1. O: Octal (System default)
2. D: Decimal
3. X: Hexadecimal
4. N: Do not print offset values

-t The main parameters for the display format of the specified data are:

1. C:ascii character or backslash sequence (e.g. \ n)
2. D: Signed decimal digits
3. F: Floating point numbers
4. O: Octal (System default)
5. U: Unsigned decimal digits
6. x: Hexadecimal numbers
   

Example: displaying the contents of a file AA in ASCII form

slot@slot-ubt:~/test$ cat aa
Hello
world
slot@slot-ubt:~/test$ 
slot@slot-ubt:~/test$ od-tc aa
0000000 h e l l o \ n w o r l d \ n
0000014
slot@slot-ubt:~/test$

Show them in 16, octal, and decimal formats, respectively:

slot@slot-ubt:~/test$ od-tcx AA
0000000 h e l l o n w o r l d \ n
    6c6c6568  6f770a6f 0a646c72
000 0014
slot@slot-ubt:~/test$ 
slot@slot-ubt:~/test$ od-tco aa
0000000 h e l l o \ n w o r l d \ n
   15433062  15735605157  01231066162
0000014
slot@slot-ubt:~/test$ od-tcd aa
0000000 h e l l o \ n W o r L d \
    1819043176  1870072431  174353522
0000014
slot@slot-ubt:~/test$

Hello world Each character corresponds to the 16 form is as follows:

0x680x650x6c0x6c0x6f
0x770x6f0x720x6c0x64

Summarize

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