On Sun Nov 09 2008 @ 1:31, JC Janos wrote:
> I've read that Perl (which I don't know yet at all) is "best" for Text
> processing like this.
>
> The thing is that I need to do this from within a Bash script, and
> assign the comma-separated list to a variable in that Bash script.
>
> Can I even use Perl like this, from inside a Bash script?
I can imagine two ways that you might do this, but neither one strikes me
as a good idea. First, you might create a Perl one-liner that could be run
just as is from within the shell script. Second, you could create a small,
self-contained Perl script, then assign the output from that to a variable
in the Bash script. Both alternatives seem error-prone and hackish to me.
More importantly, if Bash is a requirement and you don't know any Perl, I
can't quite see the value in adding Perl to your current problems.
That said, Perl could do what you need to do here pretty easily. In the
version below, I stuck the IP addresses into the same file (in the DATA
section) for convenience, but it wouldn't be any harder if they were in
a separate file. So maybe that's some incentive to learn Perl.
Hope this helps, T
#!/usr/bin/perl
use strict;
use warnings;
my @addresses;
while (<DATA>) {
if ( /(!?\d+\.\d+\.\d+\.\d+(?:\/\d+)?)/ ) {
push @addresses, $1;
}
}
my $csv = join ",", @addresses;
print "$csv";
__DATA__
1.1.1.1 # comment A
2.2.2.2/29 # comment B
!3.3.3.3 # comment C
!4.4.4.4/28 # comment D
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