I was watching a YouTube video and it told me to run the code in pre boot mac command line

"Mount -uw/"
"rm/var/db.AppleSetupDone"
"Shutdown =h now"

And now whenever I try to start the mac up, it tries to run Install, Please help !~!~!~!~!~!

(it was for restetting the password with out the disk as I have lost the disc"