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@REPLYADDR Janis Papanagnou
<janis_papanagnou+ng@hotmail.com>
@REPLYTO 2:5075/128 Janis Papanagnou
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On 03.09.2023 08:26,
hongy...@gmail.com wrote:
> I want to split a hex string into bytes and compute their xor, as shown below:
>
> werner@X10DAi:~$ data=$( sed `s/\\(..\\)/\\1 /g` <<<
23230DFE4C5336413245313636504135303333333401000A130A1814300A01010101 | sed -e `s/[ ]*$//` )
> werner@X10DAi:~$ IFS=` ` read -ra ADDR <<< "$data"; xor=0; for i
in "${ADDR[@]}"; do xor=$((xor ^ 0x$i)); done; printf `%x
` $xor
> ea
>
> I wonder if there is a more concise and simple method for this purpose.
You`ve already got a couple solutions. So just for completeness here`s
a Kornshell solution without a shell loop or external commands
data=...
printf "%2x
" $((${data//@(??)/0x\\1^}0))
(functionally it`s a variant of Ben`s proposal). Unfortunately it seems
that bash (with extglob set) does not support the \\1 in the expression?
Janis
> Regards,
> Zhao
>
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