CentOS Forget root and common user password solutions

Description of the operating system: CentOS 6.0 encountered a problem: Forget the Administrator account root password, can not enter the system solution: Reset the root password is 123456 operation: Boot system, in the system before entering the ESC key on the keyboard, will enter the following interface

Press the E key on the keyboard and the following interface appears

Using the arrow keys on the keyboard to move the cursor to the second item, and then press E on the keyboard, the following interface appears

Enter a space bar, and then after entering the number 1, return, the following interface appears

This time the cursor is positioned in the second item, continue to press the B key above the keyboard, the system will automatically restart, into the following interface

Now reset the root password

Enter passwd root, carriage return

Require a new password, enter 123,456 back to the car

Again enter 123,456 back to the car

See Passwd:all Authentication tokens updated successfully. One line

Description Password Modification succeeded

Now reboot the system and enter Shutdown-r to return

After the system automatically restarts, enter root return, then enter password 123456, the system login successfully.

Common user Forget password

1. Use the root user login system to locate the/etc/shadow file.

2. Locate the line at the beginning of the username, for example, my user name is PDS, the colon is the delimiter, the red part is the cipher encryption part

Pds:$1$civoprgf$ajwq54w1xjbiffjm05jk/1:15353:0:99999:7:::

3.pds is my username, with the terminal to execute passwd PDS command, enter a new user password can be.