Something about Linux

check kernel parameter

$cat /proc/cmdline

insert module

$insmod

remove module

$rmmod

list module

$lsmod

change kernel parameter

$vi /etc/default/grub
$sudo update-grub
$reboot

delete the first 100M of specific partition
$dd if=/dev/zero of=/dev/mmcblk0 bs=1M count=100 && sync