# copy over contents
dcfldd if=/path/to/file of=/path/to/output

# copy over contents with custom block size and status
# status is updated every time block_nums blocks are read from the input file.
dcfldd sizeprobe=if statusinterval= bs= if=/path/to/some.iso of=/path/to/output

# copy over contents of input file (if) to output (of) with ~real time status update
dcfldd sizeprobe=if statusinterval=1 bs=4M if=/path/to/some.iso of=/dev/sda