Reset Linux root and Oracle sys password

Reset Linux root user Password

Method 1
1. Boot the computer with Linux Installation CD.
2. Enter into Linux Rescue mode by enering the following command in boot screen. boot: linux rescue
3. When the shell prompt appears, enter the following commands to change root password.

$ chroot /mnt/sysimage
$ passwd

Method 2

1. When you see the grub screen press 'e' on linux which contains the word 'kernell' press 'e'
2. Go to end of that line and write 'linux single'
3. Then press 'esc' twice and press 'b' to reboot the system
4. Now wait for the prompt and type the following command to reset the password for root.

#passwd root

The above steps will prompt you to enter your new password.

Reset Oracle sys user Password

First Delete the password file and run the Oracle password utility from the command prompt as follows.

$ orapwd file=/d03/oracle/TEST/db/tech_st/11.1.0/dbs/orapwTEST password=oracle entries=5

This is your new sys password. After you log in as sys you can change it and create new passwords for system etc.