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Creating a big space holding file

Question:

How can I create a dummy file for test purposes in the unix shell?

Answer:

This creates a file 'empty.dat' of size 1 MB (1024 blocks of 1024 bytes each), all zero:

dd if=/dev/zero of=empty.dat bs=1024 count=1024

This creates a file 'random.dat' of 2 MB (2048 blocks of 1 KB each), filled with random values:

dd if=/dev/random of=random.dat bs=1024 count=2048



Generated 12:00:40 on Sep 19, 2017