How to use the common command hexdump in Linux

Editor to share with you how to use the Linux command hexdump, I believe most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

The commonly used Linux command hexdump is mainly used to view the hexadecimal coding of "binary" files. * Note: it can view any file, not limited to binary files

Syntax hexdump [options] [file]...

Option-n length: format the first length bytes of the output file

-C: output specification hexadecimal and ASCII codes

-b: single byte octal display

-c: single-byte character display

-d: double-byte decimal display

-o: double-byte octal display

-x: double-byte hexadecimal display

-s: output from offset

-e specifies the format string

The format string is enclosed in single quotation marks and is shaped like:'a format1 b 'format1' and 'format string' Each format string is composed of three parts, each is divided by spaces, such as a format1 b, b means to apply the format2 format to every b input bytes, a means to apply format2 to each an input byte, generally a > b, and b can only be 1Magi 2Q 4, in addition a can be omitted and axiom 1 can be omitted. A Gus string similar to printf can be used in format1 and format2.

D: two-digit decimal

X: three-digit hexadecimal

O: two-digit octal

% c: single character, etc.

% _ ad: marks the sequence number of the next output byte, expressed in decimal

% _ ax: marks the sequence number of the next output byte, expressed in hexadecimal

% _ ao: marks the sequence number of the next output byte, expressed in octal

% _ p: for those that cannot be displayed in regular characters. Replace

Multiple format strings are displayed on the same line, with multiple-e options

Example C language saves binary file test

# include # include int main () {FILE * fp_in; fp_in = fopen ("test", "wb"); if (fp_in = = NULL) {printf ("open test failed\ n"); return-1;} else {for (unsigned char i = 0) I compile: Gmail + main.cpp-o main execute:. / main to generate binary file test format output file

Hexdump test

Format the first 10 bytes of the output file

Hexdump-n 10 test

Format the first 10 bytes of the output file and display it in hexadecimal

Hexdump-n 10-C test

Format the output 10 bytes starting at 10 and display it in hexadecimal

Hexdump-n 10-C-s 20

Format output file characters

H

Hexdump-e'16 test 1 "X" | "'- e'16 shock 1"% _ p ""\ n "'

Hexdump-e '1gamma 1 "0x_ax"-e' 8gamma 1 "X"*"-e '8gamma 1 "% _ p"\ n"' test

Hexdump-e'1 1 "_ ad#"-e'/ 1 "hex = X *"-e'/ 1 "dec = d |"-e'/ 1 "oct = o"-e'/ 1 "_\ n"-n 20 test

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