how do I run fetchmail only if the laptop is connected?(ubuntu)

[Peter Smerdon]

Hello, at home on my desktop I have in my crontab:
# m h  dom mon dow   command
cron */10 * * * * /usr/bin/fetchmail -s  >> /home/peter/cronlog 2>&1

Which pulls in my email every ten minutes, but when I am on the road, I
would like to only run fetchmail (from cron) if I have a network
connection.

In Debian, the following would work:

,----[ fetchmail_if_connected.sh ]
| #!/bin/zsh
| 
| DEVICES='wlan0:eth0'
| FETCHMAIL='/usr/bin/fetchmail'
| OPTIONS='-s'
| 
| devices=`echo $DEVICES | sed 's/:/\\\|/g'`
| ifstate=`grep '\('$devices'\)' /etc/network/ifstate`
| if [[ $ifstate != "" ]] ; then
|   $FETCHMAIL $OPTIONS
| fi
`----

However on my ubuntu laptop there is no such file /etc/network/ifstate,
I am not sure if it is because I am using NetworkManager or because it
simply does not exist in ubuntu. So, I just need to know how to tell if
either wlan0 or eth0 is up. Any advice? 

-- 

Peter.
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