Linux to modify the root password and Linux forgot root password after the method to retrieve the password _linux

Log in as root, execute:

Copy Code code as follows:

# passwd username (change password)
# Useradd User name (add user)

The specific examples are as follows:

Copy Code code as follows:

[Root@bogon ~]# passwd Root
Changing password for user root.
New UNIX Password:
Bad Password:it are based on a dictionary word
Retype new UNIX Password:
Passwd:all authentication tokens updated successfully.

The method of root password retrieve under Linux

Linux Root has the supremacy of power, once the root password forgotten or stolen, is a very headache, then how to retrieve the root password, I summed it up as follows:

A Linux System Password cracking

1. Enter edit mode by E in the Grub options menu

2. Edit kernel that line/init 1 (or/single)

3. Restart by B

4. After entering, execute the following command

Copy Code code as follows:

root@ #passwd root (password with root configured)
Enter new UNIX password: Enter a password
root@ #init 6

(ii) Debian Linux system password cracking

1. In the Grub Options menu ' Debian gnu/linux,... (recovery mode) ', enter edit mode by E

2. Edit kernel the line of the RO single to the RW single init=/bin/bash, press B to perform the reboot

3. After entering, execute the following command

Copy Code code as follows:

root@ (None) #mount-A
root@ (none) #passwd root
root@ (None) #reboot

Three Freebsd System Password cracking

1. Boot into the Guide menu

2. Select each item (press 4) to enter Single-user mode

3. Enter a list of commands after entering

Copy Code code as follows:

root@ #mount-A
root@ #fsck-y
root@ #passwd (Change Password command)