Linux C在shell脚本中将二进制数据转换为十六进制
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Cconvert binary data to hexadecimal in a shell script
提问by davka
I want to convert binary data to hexadecimal, just that, no fancy formatting and all. hexdump
seems too clever, and it "overformats" for me. I want to take x bytes from the /dev/random and pass them on as hexadecimal.
我想将二进制数据转换为十六进制,仅此而已,没有花哨的格式等等。hexdump
似乎太聪明了,它对我来说“过度格式化”。我想从 /dev/random 中取出 x 个字节并将它们作为十六进制传递。
Preferably I'd like to use only standard Linux tools, so that I don't need to install it on every machine (there are many).
我最好只使用标准的 Linux 工具,这样我就不需要在每台机器上都安装它(有很多)。
采纳答案by unutbu
Perhaps use xxd
:
也许使用xxd
:
% xxd -l 16 -p /dev/random
193f6c54814f0576bc27d51ab39081dc
回答by Blagovest Buyukliev
Perhaps you could write your own small tool in C, and compile it on-the-fly:
也许您可以用 C 编写自己的小工具,然后即时编译它:
int main (void) {
unsigned char data[1024];
size_t numread, i;
while ((numread = read(0, data, 1024)) > 0) {
for (i = 0; i < numread; i++) {
printf("%02x ", data[i]);
}
}
return 0;
}
And then feed it from the standard input:
然后从标准输入中输入它:
cat /bin/ls | ./a.out
You can even embed this small C program in a shell script using the heredoc syntax.
您甚至可以使用 heredoc 语法将这个小 C 程序嵌入到 shell 脚本中。
回答by Blagovest Buyukliev
dd + hexdump will also work:
dd + hexdump 也可以工作:
dd bs=1 count=1 if=/dev/urandom 2>/dev/null | hexdump -e '"%x"'
回答by Zibri
Watch out!
小心!
hexdump
and xxd
give the results in different endianness!
hexdump
并xxd
以不同的字节顺序给出结果!
$ echo -n $'\x12\x34' | xxd -p
1234
$ echo -n $'\x12\x34' | hexdump -e '"%x"'
3412
http://geekandpoke.typepad.com/.a/6a00d8341d3df553ef01543533e604970c-800wi:D
http://geekandpoke.typepad.com/.a/6a00d8341d3df553ef01543533e604970c-800wi:D
回答by H?kon A. Hjortland
With od (GNU systems):
使用 od(GNU 系统):
$ echo abc | od -A n -v -t x1 | tr -d ' \n'
6162630a
With hexdump (BSD systems):
使用 hexdump(BSD 系统):
$ echo abc | hexdump -ve '/1 "%02x"'
6162630a
From http://en.wikipedia.org/wiki/Hex_dump#od_and_hexdump:
"Depending on your system type, either or both of these two utilities will be available--BSD systems deprecate od for hexdump, GNU systems the reverse."
来自http://en.wikipedia.org/wiki/Hex_dump#od_and_hexdump:
“根据您的系统类型,这两个实用程序中的一个或两个都可用--BSD 系统弃用 od 为 hexdump,而 GNU 系统则相反。”
回答by Kevin Cox
If you need a large stream (no newlines) you can use tr
and xxd
(part of vim) for byte-by-byte conversion.
如果您需要大流(无换行符),您可以使用tr
和xxd
(vim 的一部分)进行逐字节转换。
head -c1024 /dev/urandom | xxd -p | tr -d $'\n'
Or you can use hexdump
(posix) for word-by-word conversion.
或者您可以使用hexdump
(posix) 进行逐字转换。
head -c1024 /dev/urandom | hexdump '-e"%x"'
Note that the difference is endianness.
请注意,区别在于字节序。
回答by Kevin Cox
This three commands will print the same (0102030405060708090a0b0c):
这三个命令将打印相同的 (0102030405060708090a0b0c):
n=12
echo "$a" | xxd -l "$n" -p
echo "$a" | od -N "$n" -An -tx1 | tr -d " \n" ; echo
echo "$a" | hexdump -n "$n" -e '/1 "%02x"'; echo
Given that n=12
and $a
is the byte values from 1 to 26:
鉴于此,n=12
and$a
是从 1 到 26 的字节值:
a="$(printf '%b' "$(printf '\0%o' {1..26})")"
That could be used to get $n
random byte values in each program:
这可用于$n
在每个程序中获取随机字节值:
xxd -l "$n" -p /dev/urandom
od -vN "$n" -An -tx1 /dev/urandom | tr -d " \n" ; echo
hexdump -vn "$n" -e '/1 "%02x"' /dev/urandom ; echo
回答by marcinj
All the solutions seem to be hard to remember or too complex, I find using printf
the shortest one:
所有的解决方案似乎都很难记住或太复杂,我发现使用printf
最短的一个:
$ printf '%x\n' 256
100
[edit]
[编辑]
But as noted in comments, this is not what author wants, so to be fair below is full answer.
但正如评论中所指出的,这不是作者想要的,所以公平地说,下面是完整的答案。
... to use above to output actual binary data stream:
...使用上面输出实际的二进制数据流:
printf '%x\n' $(cat /dev/urandom | head -c 5 | od -An -vtu1)
what it does:
它能做什么:
- printf '%x\n' .... - prints a sequence of integers , ie.
printf '%x,' 1 2 3
, will print1,2,3,
- $(...) - this is a way to get output of some shell command and process it
cat /dev/urandom
- it outputs random binary datahead -c 5
- limits binary data to 5 bytesod -An -vtu1
- octal dump command, converts binary to decimal
- printf '%x\n' .... - 打印整数序列,即。
printf '%x,' 1 2 3
, 将打印1,2,3,
- $(...) - 这是一种获取某些 shell 命令的输出并对其进行处理的方法
cat /dev/urandom
- 它输出随机二进制数据head -c 5
- 将二进制数据限制为 5 个字节od -An -vtu1
- 八进制转储命令,将二进制转换为十进制
as a testcase ('a' is 61 hex, 'p' is 70 hex, ...):
作为测试用例('a' 是 61 十六进制,'p' 是 70 十六进制,...):
$ printf '%x\n' $(echo "apple" | head -c 5 | od -An -vtu1)
61
70
70
6c
65
or to test individual binary bytes, on input lets give 61 decimal ('=' char) to produce binary data ('\\x%x'
format does it), above command will output correctly 3d (decimal 61):
或者要测试单个二进制字节,在输入上让我们给出 61 位十进制数 ('=' char) 来生成二进制数据('\\x%x'
format 这样做),上面的命令将正确输出 3d(十进制 61):
$printf '%x\n' $(echo -ne "$(printf '\x%x' 61)" | head -c 5 | od -An -vtu1)
3d