Create File Using dd command.

In linux you can create a file and also define its size in advance.
Unlike windows OS when you create the file it get 0 kb as default size ,In linux you can specify the file size .

for example.
#dd if=/dev/zero of=/tmp/Sample.dat bs=1M count=1024

Above command will create a file called Sample.dat of size 1 GB.

For More Information Check .

http://www.linuxquestions.org/questions/showthread.php?p=4347966#post4347966

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