Passing variables to remote hosts through ssh

Hi,

I have a central administration server that has root-level public key access to my other hosts. I run scripts that use ssh to execute commands on all my hosts. How do I pass variables through ssh?

For example, suppose I want to create a directory called /tmp/newdir on 100 hosts:

#/bin/ksh

DIRNAME=newdir

for i in `cat /long/list/of/hosts`

do
ssh $i '/usr/bin/mkdir /tmp/$DIRNAME'
done

This doesn't work, because $DIRNAME doesn't get passed to the remote host. How can I make it work without hardcoding newdir in the ssh line?

Thanks.
.

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