Ubuntu :: Ping - CPU - Memory - Coding ?

I am writing a script that will ping a server and then do a command if it gets a ping that is less than 100ms or more than 100ms. Basically, I need to have a variable for the ms.

Here is an example script.

Code:

Now, all I need to do is get a variable from the ping. I know I can do this:

Code:

But that just sets the whole line, I only want the ping, without "ms" at the end.

So basically, if I ping 25.25.25.25 and get 43.872 ms I want $pingms to equal 43.872.

Also, how can I do this with free, for example:

Code:

I want $ramavail to equal the amount available and I want $ramtotal to equal the total amount.