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by mistake I deleted all the content of the /etc/passwd. I have red hat 7.2. It uses the /etc/shadow file. I don't know if this could help. Next time I will do a backup of the /etc/passwd file, but now, is there any way to recover the content of that file? i didnt restart the computer yet.
No, it means you have to rebuild your /etc/passwd file. Look in a Redhat linux manual, or maybe someone who has a redhat filesystem handy ( I don't I'm at work with no Linux) can post their /etc/passwd with only the default users listed in it and you can cut and paste it into your /etc/passwd file. Then you'll have to run adduser to rebuild the users on your system and reset their passwords, etc... Whatever you do don't reboot the box until you have a working /etc/passwd or you WILL be re-installing (or at least coming up in single-user mode to re-build /etc/passwd).