How to create random file of defined size
dd if=/dev/zero of=the_file bs=1 count=0 seek=100M dd if=./randomgruetze of=./testfile100M bs=1024 count=100000 seek=$[1024*90]
dd if=/dev/zero of=the_file bs=1 count=0 seek=100M dd if=./randomgruetze of=./testfile100M bs=1024 count=100000 seek=$[1024*90]