From owner-freebsd-questions@FreeBSD.ORG  Wed Oct 28 23:10:13 2009
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From: Jay Hall <jhall@socket.net>
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Date: Wed, 28 Oct 2009 18:10:11 -0500
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Subject: Re: gnu tar checkpoint variable expansion
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>
> Try this:
>
> /usr/local/gtar-1.22/bin/tar -cf - ${WHATTOBACKUP} \
> 	--checkpoint-action='echo=Checkpoint #%u' \
> 	--checkpoint-action="exec=/usr/local/scripts/check_disk_usage.sh $ 
> {DIR}"
>
> The use of single quotes prohibits the expansion of environment
> variables. Use double qoutes instead.

Thanks Trond, this did the trick.

Jay