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root account

Linux / Unix ssh-keygen: Create A Host Key File

How do I create a host key file to use with my applications as I can not use system defined /etc/ssh/ssh_host_rsa_key for non-root account under Linux / Unix / Apple OS X / *BSD operating systems?
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Linux Change Password

How do I change my own password as well as the passwords of other users as required under Linux operating system without using GUI systems? How can I change or set user password on Linux operating systems?
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Delete all root mail / inbox from a shell prompt

Q. I've CentOS Linux acting as router for our small community based college. I see logwatch and other cron job generating emails for root account. How do I delete those emails? I don't want to disable email facility but just wanted to get rid of all root emails.

A. The easilst way is to empty root / users email message file i.e. /var/spool/mail/root or /var/spool/mail/username. Simply type the following command at shell:
> /var/spool/mail/root

Can I create another root user account in Linux / UNIX?

Q. I’d like to create my root account in Linux. How do I do it?

A. Root user is superuser on a Unix / Linux system. Root user has all rights or permissions. . The root user can do many things an ordinary user cannot do on system such as start / stop services, grant / revoke any permissions, open ports (especially < 1024 ports), user management and much more. The root user is the most privileged user on the system and has absolute power over it. By default almost all Linux distributions and UNIX like operating system creates the root account at the time of installation. You don’t have to create a new root account. Use su or sudo command to run administrative task as the root user. Creating another root user can be a security risk. Root has a UID of zero in /etc/passwd. This means absolute control over the system for the root user. You can set any user id to 0 (zero) to grant unlimited permissions provided that you login as root. However some variants of UNIX provides additional account. For example BSD provides a toor ("root" backwards) account in addition to a root account. It is recommended that you use root only when required and there is no need to create a new root user account.

Ubuntu Linux root Password (Default Password)

I have just installed Ubuntu Linux. But, what is the default root password? I can only login as a normal user. How do I login as root user?
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Linux – What defines a user account?

Q. Can you tell us what defines a user account under Linux operating system?
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