pixelbeat

    tail -f /log/file | grep -q match
    then_do_something

    seq -f '%.1f' inf | pv > /dev/null
     ...[  12MiB/s]

    seq inf | pv > /dev/null
     ...[ 491MiB/s]

    dd bs=2M if=disk.img of=/dev/sda... status=progress iflag=direct oflag=direct