trouble with snmpwalk script

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Old 06-14-2011
I made a new script that uses the dhcp lease time to determine whether there is a new device connected to the network. Works very quickly. I have it running on my desktop with Geektool.

#! /bin/bash
#This script monitors local network via snmp
# accesslist is a txt file that sed uses to change the MAC addresses into the device name
# it notifies me via growl and displays with geektool
d=$(snmpwalk -v 2c -c publicpassword -M /usr/share/snmp/mibs:$HOME/share/mibs -m+AIRPORT-BASESTATION-3-MIB dhcp \
| sed -f /Users/user/Documents/bin/accesslist \
|sed 's/AIRPORT-BASESTATION-3-MIB::dhcpLeaseTime.//' | awk ' $4 >= 1036600 { print $1 }')
if [ ! -n "$d" ] ; then
echo "No New Connections"
echo " "$d" has renewed
it's lease"
        if [ "$d" -ne ""iPhone"" ]
growlnotify  -m " "$d" has just renewed it's lease" -a "Airport Utility" -n "NetWatch" -t "New DHCP Lease"
# I don't want a notification every time my iphone's display wakes up. it reconnects to the wifi so I added a second if statement

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AIRPORT-CONFIG(1)					      General Commands Manual						 AIRPORT-CONFIG(1)

airport-config - Configurator for the original Apple AirPort Base Station ("Graphite") and the Lucent RG-1000 base station SYNOPSIS
airport-config DESCRIPTION
airport-config allows you to manage your AirPort base station, just like the AirPort software on Mac OS X. OPTIONS
airport-config accepts no command-line options. airport-config is a wrapper script around the AirportBaseStationConfigurator.jar jar file located in /usr/share/java/airport-utils. You can set the JAVACMD environment variable to use a specific JVM instead of the one chosen by the wrapper script. Set the DEBUG environ- ment variable to 1 to get the debug output from the wrapper script. ENVIRONMENT VARIABLES
DEBUG Set this variable to 1 to get the debug output from the wrapper script. JAVACMD The full path to the Java Virtual Machine to use. By default, the wrapper uses JAVACMD; if it is not set, it looks for JAVA_BINDIR/java, then for JAVA_HOME/bin/java before looking for a java executable in the PATH. In the latter case, the JVM used can be configured using the Debian alternatives system (see update-alternatives(8)). JAVA_HOME The full path where your JDK/JRE is installed. JAVA_BINDIR The full path to the directory where the java executable is located. JAVA_ARGS Extra command-line arguments to be passed to the Java Virtual Machine. AUTHOR
airport-config was written by Jon Sevy <>. This manual page was written by Julien BLACHE <>, for the Debian project (but may be used by others). May 20, 2006 AIRPORT-CONFIG(1)