hello, ı can not remember my linux username and password but ı want to use linux again, could you help me please..

note: ı could not know linux very much so if you write understandible for me, ı will be happy ,thanks...

if you are able to boot the computer into single user mode

init s

or

init 1

you will boot into your PC as root with out entering a password

Welcome to LQ!!

In general, you should always identify what distro (version) of Linux you are using and how it is installed. (eg dual-boot with Windows, on a USB drive, etc.)

Assuming that you have the GRUB bootloader, you can always get into a linux systems as follows:
When you see the GRUB menu, hit any key to stop the countdown.
select the Linux to be booted, and enter "e" (for edit)
select the kernel line, "e" again, and add the word "single" (no quotes) at the end of the line.
Hit enter and then "b" to boot.

You will now boot into single user mode, with no password required. You can see the users by entering "more /etc/passwd". If you see a username you recognize, then you can change the password using "passwd username". You can also change the root password, or you can create a new user using "adduser".

When you are done, reboot and you will be able to log in normally.

You cannot get to single user mode using init unless you are already up and running!!! Thus, I assume you meant to append the init command in the GRUB command mode or.....?

really thank you very much everybody who wants to help me. my proplem is solved

he didnt say that it was powered/logged off...