Create a file of specified size

http://www.computing.net/unix/wwwboard/forum/6497.html

There's a little known device called /dev/zero which can quickly create a file of known size. This command:

dd if=/dev/zero of=myfile bs=1024 count=10

creates file "myfile" filled with zeros with a block size of 1000 muliplied 10 tens or 10K.