Email based on value of report

I’m looking to grep a numeric value from a tripwire report, and if the value is greater than 0, send an email. The script so far looks like this:

#!/bin/bash

tripwire --check > /tmp/twreport

count=grep 'Total violations found: 0' /tmp/twreport 

if [ $count < 1 ]; then
  mail -s "[tripwire] Report for `uname -n`" [e-mail] < /tmp/twreport
fi

Not sure how to grab the value and set it as a variable or if there’s a way to include it in the if statement itself.

Answer

First count the entries:

count=`grep -c 'Total violations found' /tmp/twreport`

Next step is simple, e.g. for more than 3 hits:

if [ $count > 3 ] ; then mail -s “[tripwire] Report for `uname -n`” [e-mail]