dd
выводит отчёт не в stdout, а в stderr. Так что нужно сначала перенаправить stderr в stdout, а потом передавать его в tee
:# башизм
dd if=/dev/zero of=/tmp/zerofile bs=100M count=5 |& tee ku.log &
# должно работать везде
dd if=/dev/zero of=/tmp/zerofile bs=100M count=5 2>&1 | tee ku.log &
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