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"killall -USR1 dd" does not work in OS X for me. However, sending INFO instead of USR1 works.
bs = buffer size (basically defined the size of a "unit" used by count and skip)
count = the number of buffers to copy (16m * 32 = 1/2 gig)
skip = (32 * 2) we are grabbing piece 3...which means 2 have already been written so skip (2 * count)
i will edit this later if i can to make this all more understandable
Replace 70 with the desired height.
Replace 180 with the desired width.
I put it in my bashrc, because by default my terminal is too small.