On Tue, 11 Jun 2002, Jacques Nilo wrote:
> It says it all. Should work for ethx and pppx IFACEs
Not sure about ethx IFACEs. I can bring an interface up even if there is
no cable plugged into the NIC... so the value of this test seems minimal
for static ip or dhcp configurations.
> Jacques
>
> #!/bin/sh
> # Check every IPDELAY seconds that IP exists for IFACE
> # J. Nilo, June 2002
>
> IFACE=eth2
> IPDELAY=3
>
> getip() {
> IP=`ip addr show $IFACE 2>/dev/null | grep inet | \
> sed 's/.*inet //;s/ .*//;s/\/.*//'`
> }
>
> echo "Starting checkip: " >> /var/log/syslog
Isn't it better to use
logger "Starting checkip"
to keep the logfile line format consistent and avoid stepping on syslogd's
toes?
> while true; do
> getip
> if ! [ "$IP" ];then
> echo "$IFACE is down"
Probably want to remove the echo command if you do something useful at
this point.
> # Execute any command here
> break
> fi
> sleep $IPDELAY
> done
> exit
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