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принимающая:
nc -l 1234 | dd of=/tmp/image.img bs=4096
отдающая:
dd if=/dev/sda bs=4096 | nc 1.2.3.4 1234

out: nc localhost 12345 < /any/file
in: nc -l 12345 > any_file.img

nc -l 1234 | bzip2 -d|dd of=/tmp/image.img bs=4096
dd if=/dev/sda bs=4096| bzip2 -9 | nc 1.2.3.4 1234