Linux Command xxd

 

The command xxd is useful when we need to convert the binary into a hexadecimal character array used in the C language.

Xxd help information is as follows: key options are marked as black.

[Root @ localhost] # xxd -- Help
Usage:
Xxd [Options] [infile [OUTFILE]
Or
Xxd-R [-s [-] offset] [-C Cols] [-PS] [infile [OUTFILE]
Options:
-A toggle autoskip: A single '*' replaces NUL-lines. Default off.
-B binary digit dump (incompatible with-P,-I,-R). Default hex.
-C Cols format <Cols> octets per line. Default 16 (-I: 12,-PS: 30 ).
-E show characters in ebcdic. Default ASCII.
-G Number of ETS per group in normal output. Default 2. The number of bytes for each goup. The default value is 2, which can be set.
-H print this summary.
-I output in C include file Style.: The output is the style of C containing files. The array method exists.
-L Len stop after <Len> octets.: after converting to Len, the conversion stops.
-PS output in postscript plain hexdump style.
-R reverse operation: Convert (or patch) hexdump into binary.
-R-s off revert with <off> added to file positions found in hexdump.
-S [+] [-] seek start at <seek> bytes abs. (or +: REL.) infile offset.
-U use upper case hex letters.: bytes are capitalized.
-V show version: "xxd v1.10 27oct98 by Juergen Weigert ".

For example:

> Xxd-G 1-I-u-l 10000000 nm. TS> xxd_test.txt

Generated text display:

Unsigned char _ 0513_1634_ch32_666_10_ts [] = {
0x47, 0x02, 0x03, 0x13, 0xf8, 0x5a, 0xc5, 0x40, 0x26, 0xe4, 0xd0, 0xde,
0xad, 0xb8, 0x76, 0x89, 0x85, 0x23, 0x06, 0x04, 0x6e, 0x05, 0x8b, 0x09,
0xc0, 0x5c, 0x96, 0x4f, 0x18, 0x51, 0x41, 0xc8, 0x40, 0x9f, 0x06, 0x93,
0x38, 0xc1, 0xbb, 0x1a, 0xbc, 0xac, 0x47, 0xff, 0x5e, 0x54, 0xeb, 0xa7,
0x14, 0x36, 0x85, 0x8a, 0x90, 0x14, 0x17, 0xa2, 0x9d, 0xc0, 0x84, 0x56,
0xcb, 0x97, 0x78, 0xc8, 0x57, 0x15, 0x3e, 0x61, 0x6f, 0xfe, 0xc9, 0x39,
0xef, 0xd3, 0xb6, 0x6a, 0xd2, 0xe4, 0xfb, 0x4c, 0x05, 0xf6, 0x03, 0xed,
0x50, 0xb3, 0xe7, 0x46, 0x57, 0x24, 0x71, 0x16, 0x38, 0x45, 0x53, 0x19,
0x56, 0x25, 0x3c, 0x8d, 0x4c, 0xa9, 0x28, 0x9a, 0xb2, 0x99, 0x76, 0x52,
0x28, 0xe9, 0xd6, 0xd6, 0x11, 0x94, 0x89, 0x19, 0x4d, 0xea, 0x68, 0x76,
0x53, 0xc6, 0xaa, 0x3a, 0xd4, 0xa1, 0x25, 0xa5, 0x03, 0xb0, 0x73, 0xa0,
0xae, 0x11, 0xc9, 0xbd, 0x37, 0x17, 0x11, 0x5f, 0x30, 0x34, 0x34, 0x0b

.....

};

Unsigned int nm. ts_len = 10000000;

In addition, in Vim, you can also convert the file to a hexadecimal format to display:

: %! Xxd

Normal display is returned:

: %! Xxd-R