Re: how to reverse an IPv4, with awk

[Geert Stappers <stappers@stappers.nl>]

On Mon, May 01, 2023 at 02:24:18AM +0200, coreyh@free.fr wrote:
> Hello list,
> 
> I wrote this script for reversing an IP:
> 
> #!/bin/bash
> 
> IP=$1
> 
> if [ -z $IP ];then
>   echo "$0 IP"
>   exit 1
> fi
> 
> REVERSE=$(echo $IP|awk -F\. '{print $4.$3.$2.$1}')
> echo $REVERSE
> 
> 
> it won't work as the output below.
> 
> $ bin/rbl.sh 61.144.56.32
> 325614461
> 
> 
> The "." was lost.
> 
> If I changed the awk line to:
> REVERSE=$(echo $IP|awk -F\. '{print "$4.$3.$2.$1"}')
> 
> 
> It becomes:
> 
> $ bin/rbl.sh 61.144.56.32
> $4.$3.$2.$1
> 

Make / mark the dot as string with " character.


|$ echo 44.33.2.1 | awk -F\. '{print $4 "." $3 "." $2 "." $1}'
|1.2.33.44
|$



> Can you help with this?

I tent to ignore yes-no-questions.


 
Groeten
Geert Stappers
-- 
Silence is hard to parse