..
xxd 使用
字符串到16进制
$ echo -n "hello world" | xxd -g1
00000000: 68 65 6c 6c 6f 20 77 6f 72 6c 64 hello world
十六进制到字符串
$ echo -e "\x68\x65\x6c\x6c\x6f\x20\x77\x6f\x72\x6c\x64"
hello world
[options]说明
-n do not output the trailing newline
-g number of octets per group in normal output. Default 2 (-e: 4).
-e enable interpretation of backslash escapes