bash script in background

noir911 · 03-22-2009, 07:23 PM

I'm trying to write a script that will always be running in the background
and awk for the first column in the output; if the output don't match with
my predefined output, it will send out an email.

The current output I'm getting is

Quote:

00:30:96:16:24:23 -> 00:1b:cf:12:a7:21 192.168.25.1 -> 192.168.25.25

I would like to awk the "00:30:96:16:24:23" and match against my pre-defined "00:30:96:16:24:23"

Here's my script

Code:

#!/bin/bash
tshark -i eth0 -n port 68 -R 'bootp.type == 2' -o column.format:'"Source MAC","%hs","Destination MAC","%hd","Source","%s","Destination","%d"'

Thanks for any help.

ghostdog74 · 03-22-2009, 07:28 PM

to get a column in awk... such as column 1, use $1.

noir911 · 03-22-2009, 08:25 PM

Quote:

Originally Posted by ghostdog74

to get a column in awk... such as column 1, use $1.

I tried

Code:

#!/bin/bash
tshark -i eth0 -n port 68 -R 'bootp.type == 2' -o column.format:'"Source MAC","%hs","Destination MAC","%hd","Source","%s","Destination","%d"' | awk {'print $1'}

But I get no output.

ghostdog74 · 03-22-2009, 08:27 PM

hint at awk: you got your single quotes wrong.

noir911 · 03-22-2009, 09:46 PM

I have rewritten the script but it only prints "foo" when I type ^c.

Code:

#!/bin/bash
tshark -i eth0 -n port 68 -R 'bootp.type == 2' -o column.format:'"Source MAC","%hs"'
MAC1="00:b6:f5:91:12:46"

ARG1=$1
if [ "$ARG1" != "$MAC1" ]; then
 echo "foo" 
fi