dd if=/tmp/testfile of=/dev/null bs=1G count=1 iflag=direct
if=/tmp/testfile: This is the input file we created earlier.
of=/dev/null: This discards the data we read.
bs=1G: Again, the block size is 1 gigabyte.
count=1: We're reading one block.
iflag=direct: This uses direct I/O."
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