To display IP addresses assigned to router's interfaces (excluding interfaces with no IP address) use show ip interface brief | exclude unassigned command.

Here is a sample printout:

C1#show ip int brief | excl unassigned  
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            172.16.0.1      YES NVRAM  up                    up      
Serial1/0                  10.0.7.17       YES NVRAM  up                    up      
Loopback0                  10.0.1.1        YES NVRAM  up                    up      
Tunnel0                    192.168.0.1     YES manual up                    up      

You could define an alias to create a new IOS command generating this printout, for example, alias exec ipconfig show ip interface brief | exclude unassigned.

List of useful aliases

alias exec ifconfig show ip interface brief | exclude unassigned
alias exec sofn show ip ospf neighbor
alias exec proc show processes cpu | exclude 0.00%__0.00%__0.00%

A handy script ( taken from this site ) to keep the ACLs of our Cisco Catalyst 3560 in separate files, so as be able to edit them without connecting to the device and finally update them on the switch by using a perl script like this:

#! /usr/bin/perl -w
# Note: in Debian/Ubuntu you need libnet-telnet-perl package
# to be installed on your system.

use Net::Telnet;
use File::Basename;

my $host = '1.1.1.1';
my $hostname = 'Switch';
my $username = 'ciscouser';
my $passwd = 'ciscopasswd';
my $enable = 'enablesecret';
my $aclname = $ARGV[0];
my $filepath = dirname($0)."/".$aclname;
my $logfile = '/tmp/acl-update.log';

sub Usage {
        print "Usage:    " . basename($0) . " \n";
    exit 1;
}

if ( scalar @ARGV != 1)
{
    print "Wrong number of arguments!\n";
    &Usage();
}

if ( ! -e $filepath )
{
    print "File " . $filepath . " does not exist\n";
    &Usage();
}

open(ACL, $filepath) || die("Could not open file $aclname!");
@file = <ACL>;

$session = Net::Telnet->new(Timeout => 05,
                             Prompt => '/$hostname(\(config.*\))?[#>] *$/',
                             Dump_Log => '$logfile');
$session->open($host);
$session->login($username, $passwd);

$session->cmd("en\n$enable");
$session->cmd("conf t");
$session->cmd("no ip access-list extended $aclname");
$session->cmd("ip access-list extended $aclname");
foreach $line (@file)
{
   chomp($line);
   $session->cmd($line);
}
$session->cmd("exit");
$session->cmd("exit");
@output = $session->cmd("sh access-list $aclname");
print @output;
$session->cmd("exit");

interface FastEthernet0/5
description IP PHONE x1014 & HOST 10.1.20.5
switchport access vlan 20
switchport trunk encapsulation dot1q
switchport trunk native vlan 20
switchport trunk allowed vlan none
switchport mode access
switchport nonegotiate
switchport block multicast
switchport block unicast
switchport voice vlan 101
switchport port-security
switchport port-security maximum 3
switchport port-security aging time 10
switchport port-security aging type inactivity
no ip address
ip access-group ip-device-list in
mls qos trust device cisco-phone
mls qos trust dscp
dot1x port-control auto
dot1x guest-vlan 999
dot1x reauthentication
mac access-group mac-device-list in
spanning-tree portfast
spanning-tree bpdufilter enable
spanning-tree bpduguard enable
spanning-tree guard root
!
interface FastEthernet0/6
description *** UNUSED Port ***
switchport access vlan 999
switchport trunk encapsulation dot1q
switchport trunk native vlan 999
switchport trunk allowed vlan none
switchport mode access
switchport nonegotiate
switchport block multicast
switchport block unicast
switchport port-security
switchport port-security aging time 10
switchport port-security aging type inactivity
no ip address
ip access-group ip-device-list in
shutdown
mls qos cos override
storm-control broadcast level 0.00
storm-control multicast level 0.00
storm-control unicast level 0.00
dot1x port-control force-unauthorized
dot1x guest-vlan 999
dot1x host-mode multi-host
mac access-group mac-device-list in
no cdp enable
spanning-tree portfast
spanning-tree bpdufilter enable
spanning-tree bpduguard enable
spanning-tree guard root 

bba-group pppoe vpn1 
 virtual-template 1 
 sessions per-vc limit 1 (1 max number of vpdn session per-vc)
 sessions per-mac limit 1 ( 1 max number of vpnd session per-mac)
 sessions per-mac throtlle ...