How to create a junk file for testing speed-transfers? May 17, 2015 • guidedmissile Creating a test file - 10MB dummy file dd if=/dev/zero of=dummu.file bs=1024 count=0 seek=$[1024*10] PKG_MIN_SIZE=400k MAIN_FILE=dummy.file split -b $PKG_MIN_SIZE $MAIN_FILE segment collecting list of all new segment - filenames