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l@l-PC:/lib64$ 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 -ps,-i,-r). Default hex.                                                                                                                 -C          capitalize variable names in C include file style (-i).                                                                                                                       -c cols     format  octets per line. Default 16 (-i: 12, -ps: 30).                                                                                                                  -E          show characters in EBCDIC. Default ASCII.                                                                                                                                     -e          little-endian dump (incompatible with -ps,-i,-r).                                                                                                                             -g          number of octets per group in normal output. Default 2 (-e: 4).                                                                                                               -h          print this summary.-i          output in C include file style.-l len      stop after  octets.-o off      add  to the displayed file position.-ps         output in postscript plain hexdump style.-r          reverse operation: convert (or patch) hexdump into binary.-r -s off   revert with  added to file positions found in hexdump.-s [+][-]seek  start at  bytes abs. (or +: rel.) infile offset.-u          use upper case hex letters.-v          show version: "xxd V1.10 27oct98 by Juergen Weigert".

用法

直接读取xxd

l@l-PC:~$ cat 1.txt 
12345
l@l-PC:~$ xxd 1.txt 
00000000: 3132 3334 350a                           12345.

指定格式[-ps]

output in postscript plain hexdump style

l@l-PC:~$ xxd -ps  1.txt 
31323334350a

指定长度[-l 3]

l@l-PC:~$ xxd -ps -l 3  1.txt 
313233

指定偏移[-s1]

l@l-PC:~$ xxd -ps -l 3  -s1 1.txt 
323334

转换[-r]

l@l-PC:~$ xxd -ps  1.txt  > 1.bin
l@l-PC:~$ 
l@l:~$ xxd  -r -ps  1.bin
12345