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How to recover / change the root password on RedHat Linux based systems

How to recover / change the root password on RedHat Linux based systems

Power on, or reboot as needed.

and press 'tab' key

Now you should press 'e' and you will get this screen.

plz select kernel option

now press 'e'

Insert an space and the number one '1'.

After that press ENTER and 'b' and ENTER again.

Now you can change the password like this

#passwd

enter new password

then

give

#chmod u+s /bin/su

and

#exit