Find IP på interface og brug i shell script.

Her er et udklip fra et firewall shell script jeg arbejder på i øjeblikket


#!/bin/bash
# GIAC enterprises
# (C) 2004 Kim Guldberg
#
#-----------------------------------------------------------------------------
# SETUP ENVIRONMENT VARIABLES
#-----------------------------------------------------------------------------
IPTABLES="/sbin/iptables"         # Iptables binary

LO_INT="lo"            # Loopback Interface
LAN_INT="eth1"        # Internal Interface to LAN
WAN_INT="eth0"        # External Interface to Internet
DMZ_INT="eth2"        # DMZ Interface
PPTP_INT="ppp+"        # PPTP interface
IPSEC_INT="ipsec+"        # IPSEC interface
LAN_NET="10.0.0.0/24"        # allowed to access the internet
DMZ_NET="172.16.1.0"        # The service network

# Get the IP-address for the interfaces
LAN_IP="`ifconfig $LAN_INT | grep \"inet addr\" | cut -f 2 -d \":\" | cut -f 1 -d \" \"`"
WAN_IP="`ifconfig $WAN_INT | grep \"inet addr\" | cut -f 2 -d \":\" | cut -f 1 -d \" \"`"
DMZ_IP="`ifconfig $DMZ_INT | grep \"inet addr\" | cut -f 2 -d \":\" | cut -f 1 -d \" \"`"

LO_IP="127.0.0.0"        # Loopback device
INT_MAILSERVER="10.0.1.11"        # The mail server on the LAN
INT_DB_SERVER="10.0.1.10"        # The DB server on the LAN
DB_PORT=1433            # The port used for DB synchronization
ROUTER_CONFIG="10.0.0.3"        # The ip number allowed to configure the router
LO_FP="10.0.1.12"        # Head office file and print server
LO_DC="10.0.1.13"        # Head office Domain controller

INT_DNS="172.16.1.3"        # The dns server on the service network
EXT_MAILSERVER="172.16.1.6"        # The mail server on the service network
EXT_WEBSERVER="172.16.1.7"        # The web server on the service network
EXT_SSH_SERVER="172.16.1.4"        # The ssh system for partners and suppliers on the service
# network
EXT_DB_SERVER="172.16.1.5"        # The DB server on the service network
EXT_NTPSERVER="172.16.1.3"        # The NTP server on the service network
EXT_SYSLOGSERVER="172.16.1.3"    # The logging server on the service network

BORDERROUTER="1.1.1.2"        # The border router
EXT_DNS="1.1.1.10"        # The dns server provided by the ISP

PPTP_USER_1="2.2.2.2"        # PPTP remote office user 1

RO1_EXT_IP="3.3.3.3"
RO1_FP="10.1.1.12"        # Remote office 1 File and print server
RO1_MAILSERVER="10.1.1.11"        # Remote office 1 mail server
RO1_DC="10.1.1.13"        # Remote office domain controller

Ok, takker det hjalp...
Fik grænset mit svar ned til:
PPP="eth0"

LAN_IP="`ifconfig $PPP | grep \"inet addr\" | cut -f 2 -d \":\" | cut -f 1 -d \" \"`"

echo $LAN_IP

Lige præcist