On 02/19/2011 04:09 AM, Patrick Lists wrote:
[snip]
Here's how I would try to solve it. Totally untested, use at own risk.
Mind the linewrap. It's all one line. My box has lo, br0, eth0 and
virbr0 so the script should give a total of 4 interfaces.
$ ifconfig -a | grep -vE 'inet|UP|RX|TX|collisions|Interrupt' | awk
'BEGIN {no_of_interfaces=0} /^[a-z]/ {print $1}' | awk 'END
{no_of_interfaces=NR; print "Number of interfaces: " no_of_interfaces}'
Number of interfaces: 4 (correct so apparently this works)
Rereading your question and the script above it greps all interfaces
while I think you only need the eth interfaces. If that is the case
change /^[a-z]/ to /^eth/
$ ifconfig -a | grep -vE 'inet|UP|RX|TX|collisions|Interrupt' | awk
'BEGIN {no_of_interfaces=0} /^eth/ {print $1}' | awk 'END
{no_of_interfaces=NR; print "Number of interfaces: " no_of_interfaces}'
Number of interfaces: 1
Regards,
Patrick
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