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    device=/dev/rmt8
    dd_noise='^[0-9]+\+[0-9]+ records (in|out)$'
...
    status=`((dd if=$device ibs=64k 2>&1 1>&3 3>&- 4>&-; echo $? >&4) 
+|
        egrep -v "$dd_noise" 1>&2 3>&- 4>&-) 4>&1`
    exit $status;