RHEL6.3 into single-user mode

The single-user mode is similar to the security mode under Windows, allowing the root account to boot directly and log into the system for system maintenance without entering a password.

Single-user mode allows only the root account to log in, and does not allow other users to connect remotely using the SSH protocol.

To restart the system, press ENTER to enter the following interface:

Select the second item, press E

Press E to enter the kernel edit command line, and then enter single or S or 1 or init 1 in the cursor space

After the input is completed, press ENTER, save to return to the previous boot menu, press B to start the system automatically into single user mode.

After startup, you do not need to enter a password to automatically login to the root account

input Vi/etc/inittab to re-modify the boot level.

if it is forgotten Root password for the account, then

input #vi/etc/passwd Command
The first line of the root:x:0 .... in the X Delete, become root::0 .... and then save the exit !
Reboot the system.
in the system at this time Root the password is empty.
then enter the command to change the password: passwd Root

RHEL6.3 into single-user mode