# contents of file:
!
blah
!
blah
blah
!
# start to grab section here with start (/interface/)
interface GigabitEthernet1/1/2
 description PC Trunk
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 100
 switchport mode trunk
 queue-set 2
 priority-queue out 
 mls qos trust dscp
 storm-control broadcast level 1.00
 storm-control multicast level 1.00
 spanning-tree guard loop
 channel-protocol lacp
 channel-group 1 mode active
! 
# ^ end section with (/!/)
# ignore entire block of data when after (/interface/) a (/shutdown/) is seen before (/!/)"
interface GigabitEthernet1/1/3
 shutdown
!
interface GigabitEthernet1/1/4
 shutdown
!
interface TenGigabitEthernet1/1/1
!
interface TenGigabitEthernet1/1/2

#*** Begin of sad attempt PL ***

#!/usr/bin/perl -w
#
use strict;
use warnings;

my $CONFIGFILE = $ARGV[0];
print "$CONFIGFILE\n";

open(FILE, $CONFIGFILE) || die "file not found\n";

while (<FILE>)
        {
        if ($_ =~/^interface/../shutdown/)
                {
                next;
                }
        if ($_ =~/^interface/../!/)
                {
                print $_;
                }
        }