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Swich statement based on a grep?

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# 1  
Old 07-14-2008
Swich statement based on a grep?
I'm piping the results of a tcpdump into a shell script and want certain commands executed (specifically the firing of an SNMP alert) based on a grep for certain contents in the output of tcpdump.

For example, I have

Code:
#!/bin/bash
while read str; do
grep 'ttl 64' -q && sudo snmptrap -v 1 -c private 127.0.0.1 1.3.6.1.4.1.2011.0.6.4 "" 6 23 ""
grep 'ttl 128' -q && sudo snmptrap -v 1 -c private 127.0.0.1 1.3.6.1.4.1.2011.1.2.8 "" 6 23 ""
done

However, this simply waits for a string that matches ttl64 and then waits for one matching ttl128, I need it to continually spot matches and fire the packet based on which is matched. Any ideas for a better script?

Cheers.
# 2  
Old 07-14-2008
This is how it can be done using perl:
Code:
#!/usr/bin/perl

use File::Tail;
  $file=File::Tail->new("file");
    while (defined($line=$file->read)) {
       if ($line =~ /ttl 64|ttl 128/) { system('YOUR COMMAND'); };
}

# 3  
Old 07-14-2008
If you have ksh93 something like the following should work.
Code:
#!/bin/ksh93t

while read str
do
   [[ $str == *+(ttl 64)* ]] && sudo ......
   [[ $str == *+(ttl 128)* ]] && sudo .....
done < file

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