Lost Password in Linux Centos

Boot from cd rom using dvd centos installation and write “linux rescue” enter the following  command until mount file image “chroot /mnt/sisimage/

Edit /etc/shadow to remove

if you can do this, just type “passwd” once you are in and change it to whatever you like. Or just edit /etc/shadow to remove the password field: move to just beyond the first “:” and remove everything up to the next “:”. With vi, that would be “/:” to move to the first “:”, space bar once, then “d/:” and ENTER. You’ll get a warning about changing a read-only file; that’s normal. Before you do this, /etc/shadow might look like:

root:$1$8NFmV6tr$rT.INHxDBWn1VvU5gjGzi/:12209:0:99999:7:-1:-1:1074970543
bin:*:12187:0:99999:7:::
daemon:*:12187:0:99999:7:::

adm:*:12187:0:99999:7:::

and after, the first few lines should be:

root::12209:0:99999:7:-1:-1:1074970543
bin:*:12187:0:99999:7:::
daemon:*:12187:0:99999:7:::
adm:*:12187:0:99999:7:::
You’ll need to force the write: with vi, “:wq!”.

write “Exit’. system automatically restart.

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