[Trisquel-users] Re : How can one capture the "Failed to resolve" output to console during an nMap scan ?

[lcerf]

The third column of "output-2-column-file.txt" cannot be computed from the  
input alone, as far as I understand.   Is the script you want supposed to  
take the list of hostnames (the first column of beginning-5-col-file.txt) and  
compute what you call "literal IPv4"?  If so, why is  
"ns530300.ip-198-27-67.net" mapped to 53.198.27.67?  That makes little sense  
to me (and, indeed, 53 is not part of the actual address).

Defining the "literal IPv4" as the first sequence, in the hostname, of four  
numbers (separated by any number of other characters) that are all smaller  
than 256, I wrote that:
$ tr -sc 0-9\\n ' ' < hostname_list | awk '{ k = 0; for (i = 0; k < 4 && ++i