need bash help for multiple line test

From: Todd <Todd@xxxxxxxxxxxxxxx>
Date: Mon, 30 Jul 2012 22:24:23 -0700

Hi All,

In bash script, if I have a variable that looks like

echo $A
/dev/sda2
/dev/sda2
/dev/sdb1
/dev/sdb3

and I want to test each one for the existence of
a type of partition, stopping at the first instance
of what I want, how would I write such a thing?
Is there a way to do readline on a variable?

Many thanks,
-T
.

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