Linux system root password forgot what to do three ways to quickly retrieve the root password

Linux Root Password retrieval method One
1th step: In the system into a single user state, directly with passwd root to change.
2nd Step: Boot the system with the installation CD, the Linux rescue State, the original/partition hook up, as follows:
cd/mnt mkdir HD mount-t auto/dev/hdax (original/partition number) HD CD HD　　Chroot./passwd Root
Step 3rd: Take down the hard drive of this machine and hang it on other Linux systems, using the same method as the second.
Linux Root Password retrieval method Two
1th step: When you boot the system with Lilo: Type Linux single
screen when the Lilo: prompt appears lilo:linux single
Step 2nd: Back The car can go directly to the Linux command line
3rd: Use the following command "Vi/etc/shadow" to delete the first line, that is, Root: After and Next: The first row is deleted from the previous one, and a row will resemble root:: ... Save
Vi/etc/shadow
4th step: Reboot reboot, the root password is empty.　　
Linux Root Password retrieval method Three
1th step: When booting the system with grub: When the Grub screen appears, use the up and down keys to select the one you normally start Linux (do not choose Dos yo), then press the E key
2nd step: Use the upper and lower keys again to select the one you normally start Linux (similar to kernel/boot/vmlinuz-2.4.18-14 ro root=label=/), and then press the E key
3rd step: Modify the command line you see now, add single,　　The results are as follows:
kernel/boot/vmlinuz-2.4.18-14 single ro root=label=/single
Step 4th: Enter back, then press B to start, and go directly to the Linux command line.
5th: Use the following command "Vi/etc/shadow" to delete the first line, that is, Root: After and Next: The first row will be similar to root:: ... Save  : wq!

6th step: Reboot reboot, the root password is empty.

Linux system root password forgot what to do three ways to quickly retrieve the root password