find / -name grub*
find / -name grub -a -type f
vim /boot/grub/grub.conf
df -Th
gunzip /root/Desktop/splash.xpm.gz
vim /root/Desktop/splash.xpm
grub-md5-crypt
grub-crypt
grub> help root
grub> root (hd0,0)
grub> kernel /vmlinuz-2.6.32-696.el6.x86_64 ro root=/dev/mapper/vg_xxx-lv_root
grub> initrd /initramfs-2.6.32-696.el6.x86_64.img
grub> boot
init 0
init 1
init 2
init 3
init 4
init 5
init 6
pstree
pstree -p
ps aux
ps aux | grep “firefox”
kill 3468
kill 3405
kill -l
kill -9 3405
vim /etc/inittab
jobs
fg 1
cd /etc/rc.d/
cd /etc/rc.d/rc0.d/
dd if=/dev/sda of=/tmp/mbr.bak bs=512 count=1
hexdump /tmp/mbr.bak
hexdump -C /tmp/mbr.bak
dd if=/dev/zero of=/dev/sda bs=512 count=1
parted /dev/sdb -s mklabel gpt
parted /dev/sdb -s mkpart primary 1M 100M
mkfs.ext4 /dev/sdb1
mkdir /mnt/ext4/
mount /dev/sdb1 /mnt/ext4
cp /tmp/mbr.bak /mnt/ext4/
reboot
sed -i “/id:5:default:/c id:3:initdefault:” /etc/inittab