Using Grep and regex to pull a value out of a string

[thestonefox]

Hi all

I'm new to shell script and I want to write a script that checks to see how many of my virtual machines are running and if it is below the correct amount to send me an email

the command i need to run is simply

$ vmrun list

this returns me

Total Running VMs: 4

so basically i want to write a script that says

myvar = `vmrun list | grep [only get me the number, e.g. 4] | wc -l`

if [ $myvar < 4 ] then
email me a message at 'mymail@mail.com' saying 'not all vms are running'

or even

email me a message at 'mymail@mail.com' with the output from the command vmrun list

If anyone could help me with the actual shell script then I'd be very happy

[redhead]

Awk will be better for this ie:

#!/bin/sh
NUMBER=`vmrun list | awk '{print $NF}'`
if [ $NUMBER le 3 ] ; then
  echo "Less than the desired 4 running" | mail -s "Stats from wmrun" mymail@mail.com
else
  echo "equal or more than the desired 4 running" | mail -s "Stats from wmrun" mymail@mail.com
fi