Re: extracting an IPv4 address from text?

On 4/2/22 15:10, Robert Huff wrote:
> Hello:
> 	Let's suppose I want to parse a line from auth.log and extract
> the IP address (if any) to stdout.
> 	I'm assuming there is a robust way to do this using standard
> command-line tools ... but my brain is flailing on the exact method.
> Anyone have a example they'd be willing to share?  Or is this a
> problem already solved?
>
>
> 				Hopefully,
>
>
> 					Robert Huff
>
>
>
>
> 				
>

If perl is available:


$ perl -MRegexp::Common='net' -n -e "print if $_ =~ $RE{net}{IPv4}" 
/path/to/logfile


Edgar