If you want help with these "many syntax errors", you will have to show them to us.

OMG! It is works! I had a problem like: Global symbol "$s" requires explicit package name at csc-getinfo.pl line 34. because last line was $s->close; Now I rewrite a little bit a script.

#!/usr/bin/perl

use strict;
use warnings;
use Net::Appliance::Session;


my @ipconadd = qw(1.1.1.1 2.2.2.2 3.3.3.3);

foreach my $ip (@ipconadd) {
    print "Processing $ip:\n";

        my $s = Net::Appliance::Session->new({
        personality => 'ios',
        transport => 'SSH',
        host => $ip
        });


eval {
        $s->connect({ username => 'login', password => 'password' });
        $s->begin_privileged({ password => 'verycoolbro' });
        print $s->cmd('show hostname');
        print $s->cmd('show inventory | i SN');
        $s->end_privileged;
        $s->close;

      };
    print "IP $ip done.\n";
    };
        if ($@) {
      warn "failed to execute command: $@";
      }
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