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
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