Practice

This example displays how to copy the data in temporary file, /tmp/tmpfile to the destination which is inserted after removing the source.

#dd if=/tmp/tmpfile of=/dev/fd0

28+1 records in

28+1 records out

where 28+1 records in means

Numbers of partial and full blocks read in the current input block size. ie

28+1 records out means

Numbers of partial and full blocks written in the current output block size.

Where if=FILE

read from FILE instead of stdin

of=FILE

write to FILE instead of stdout bs=BYTES

force ibs=BYTES and obs=BYTES

At last remove the temporary file:

#rm /tmp/tempfile