modprobe -h, --help Print a usage message and then exit. -o, --upgrade Upgrade an older array to the current kernel's RAID version. Preserve data on the old array. -V, --version Print version information and then exit. mkswap mkswap [option] device [size] Description System administration command. Create swap space on device. You may specify its size in blocks; each block is a page of about 4KB. Linux Commands Option -c Check for bad blocks before creating the swap space.