xxd command_examples

xxd – make a hexdump or do the reverse.

Print everything but the first three lines (hex 0x30 bytes) of file.

% xxd -s 0x30 file

Print 3 lines (hex 0x30 bytes) from the end of file.

% xxd -s -0x30 file

Print 120 bytes as continuous hexdump with 20 octets per line.

% xxd -l 120 -ps -c 20 xxd.1

2e54482058584420312022417567757374203139
39362220224d616e75616c207061676520666f72
20787864220a2e5c220a2e5c222032317374204d
617920313939360a2e5c22204d616e2070616765
20617574686f723a0a2e5c2220202020546f6e79
204e7567656e74203c746f6e79407363746e7567

Hexdump the first 120 bytes of this man page with 12 octets per line.

% xxd -l 120 -c 12 xxd.1
0000000: 2e54 4820 5858 4420 3120 2241 .TH XXD 1 "A
000000c: 7567 7573 7420 3139 3936 2220 ugust 1996"
0000018: 224d 616e 7561 6c20 7061 6765 "Manual page
0000024: 2066 6f72 2078 7864 220a 2e5c for xxd"..\
0000030: 220a 2e5c 2220 3231 7374 204d "..\" 21st M
000003c: 6179 2031 3939 360a 2e5c 2220 ay 1996..\"
0000048: 4d61 6e20 7061 6765 2061 7574 Man page aut
0000054: 686f 723a 0a2e 5c22 2020 2020 hor:..\"
0000060: 546f 6e79 204e 7567 656e 7420 Tony Nugent
000006c: 3c74 6f6e 7940 7363 746e 7567 output_file

Patch the date in the file xxd.1

% echo "0000037: 3574 68" | xxd -r - xxd.1
% xxd -s 0x36 -l 13 -c 13 xxd.1
0000036: 3235 7468 204d 6179 2031 3939 36 25th May 1996

Create a 65537 byte file with all bytes 0x00, except for the last one which is ‘A’ (hex 0x41).

% echo "010000: 41" | xxd -r > file

Hexdump this file with autoskip.

% xxd -a -c 12 file
0000000: 0000 0000 0000 0000 0000 0000 ............
*
000fffc: 0000 0000 40 ....A

Create a 1 byte file containing a single ‘A’ character. The number after ‘-r -s’ adds to the line numbers found in the file; in effect, the leading bytes are suppressed.

% echo "010000: 41" | xxd -r -s -0x10000 > file

Use xxd as a filter within an editor such as vim(1) to hexdump a region marked between `a’ and `z’. :’a,’z!xxd

Use xxd as a filter within an editor such as vim(1) to recover a binary hexdump marked between `a’ and `z’.

:'a,'z!xxd -r

Use xxd as a filter within an editor such as vim(1) to recover one line of a hexdump. Move the cursor over the line and type:

!!xxd -r

Read single characters from a serial line

% xxd -c1 < /dev/term/b &
% stty /dev/term/b